Diemazz

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← 10 11 12 13 14 15 16 17 18 19 → List of numbers — Integers 0 10 20 30 40 50 60 70 80 90 →
Cardinal	nineteen
Ordinal	19th (nineteenth)
Numeral system	nonadecimal
Factorization	prime
Divisors	1, 19
Roman numeral	XIX
Binary	100112
Octal	238
Duodecimal	1712
Hexadecimal	1316

19 (nineteen) is the natural number following 18 and preceding 20. It is a prime number.

Look up nineteen in Wiktionary, the free dictionary.

In mathematics

Nineteen is the 8th smallest prime number. The sequence continues 23, 29, 31, 37... 19 is the seventh Mersenne prime exponent. 19 is the smallest Higgs prime for squares and cubes that has an index among Higgs primes that is less than its index among primes overall (because 17 is not a Higgs prime).

Nineteen is the aliquot sum of two odd discrete biprimes, 65 and 77 and is the base of the 19-aliquot tree.

In science

• The atomic number of Potassium.

In religion

• The number of angels guarding Hell according to the Qur'an: "Over it is nineteen" (74:30)
• The number of surat Maryam in the Qur'an
• The number of Arabic letters in the common formula, the Basmala, "In the name of God, Most Gracious, Most Merciful," being (without vowel marks) "bsm allh alrḥmn alrḥym" [1]
• A number allegedly encoded in the Qur'an [2] as claimed by Dr. Rashad Khalifa, a biochemist from the USA [3] and [4]
• The Bahá'í calendar is structured such that a year contains 19 months of 19 days each (along with the intercalary period of Ayyám-i-Há), as well as a 19-year cycle and a 361-year (19x19) supercycle. The Báb and his disciples formed a group of 19, and there were 19 Apostles of Bahá'u'lláh.

In music

• 19 is the debut album from English soul and jazz singer Adele.
• 19 is the fourth studio album from Russian pop singer Alsou.

"19" is a 1985 hit song by Paul Hardcastle, with a strong anti-war message, including sampled soundbites taken from a documentary about the Vietnam War in which 19 is claimed to have been the average age of United States soldiers killed in the conflict (an assertion which is widely disputed^{[citation needed]}). The song was parodied by British satirist Rory Bremner as N-n-nineteen, Not Out, the title referring to the English cricket team's risible performance against the West Indies in the previous year.

With a similar name and anti-Vietnam War theme, I Was Only 19 (A Walk in the Light Green), by the Australian group Redgum reached number one on the Australian charts in 1983. In 2005 a hip hop version of the song was produced by The Herd, and was voted in at #18 in the 2005 Triple J Hottest 100 playlist.

Other songs with the number 19 in their titles:

"Nineteen" by Bad4good

"Nineteen" by Buck-O-Nine

"Nineteen" by Phil Lynott

"Nineteen" by the Old 97's

"Hey Nineteen" by Steely Dan

"19th Nervous Breakdown" by the Rolling Stones

"Nineteen Forever" by Joe Jackson

"I Got A Feeling (Just Nineteen)" by Eagles of Death Metal

"Nineteen in Naples" by Jonathan Richman

"Nineteen" by Tegan and Sara

"Balance of the 19" by Secret Chiefs 3

"Not Nineteen Forever" by The Courteeners

Nineteen has been used as an alternative to twelve for a division of the octave into equal parts. This idea goes back to Salinas in the sixteenth century, and is interesting in part because it gives a system of meantone tuning, being close to 1/3 comma meantone.

19 is also the title of Evan Yo's first album, because Evan was nineteen years old when the album released.

Some organs use the 19th harmonic to approximate a minor third.

Literature

• Stephen King's seven book epic The Dark Tower saga employs the number 19 in books The Gunslinger, Wolves of the Calla, Song of Susannah, and The Dark Tower as a mysterious and important number. Such as the Ka-Tet of nineteen and many names adding up to nineteen, along with the number being a powerful key.

• In Harry Potter and the Deathly Hallows the epilogue starts 19 years after the end of the actual story.

In Games

19 is the command in Age of Empires for the laughing emote. This was an easier way to laugh before lol existed.

In other fields

Nineteen is:

• The nineteenth state to enter the Union of the United States was Indiana
• Part of the name of a breakfast cereal: Product 19
• The Soviet submarine K-19 was the first Soviet nuclear ballistic submarine
• I-19 is the designation for a US interstate highway in Arizona
• the height, in feet, of the statues of Abraham Lincoln and Thomas Jefferson in their respective memorials.
• 19 years is very close to 235 lunations. See Metonic cycle
• In golf the "19th hole" is the clubhouse bar. In miniature golf it is an extra hole on which the winner earns an instant prize
• A number encoded in Chemistry as claimed by Dr. Peter Plichta, a German chemist [5]. Also see [6] for Plichta's claimed code-19 in chemistry
• The retired football jersey number of Hall of Famers Johnny Unitas and Lance Alworth
• The jersey number of Lionel Messi in Barcelona FC and Stefano Giovannetti in the Blizzard Inferno (Calgary)
• The retired baseball jersey number of Baseball Hall of Fame members Robin Yount,Tony Gwynn, and Bob Feller.
• The retired basketball jersey number of Willis Reed.
• The retired hockey jersey number of Steve Yzerman.
• The number of Colorado Avalanche center and captain Joe Sakic
• The number of Vancouver Canucks winger and captain Markus Naslund
• 19 x 19 is also the standard size of a Go Board
• The notional score of a single hand of Cribbage that is actually worth no points. (It is not possible to earn a score of 19 in a single hand in Cribbage.)
• The number of Ottawa Senators center Jason Spezza
• The number of the French department Corrèze

Historical years

A.D. 19, 19 B.C., 1919, 2019, etc.

External links

• 19.ORG
• Prime Curios for the number 19
• Agir XIX

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