81 (number)

81 (eighty-one) is the natural number following 80 and preceding 82.

← 80 81 82 →
← 80 81 82 83 84 85 86 87 88 89 → List of numbers Integers ← 0 10 20 30 40 50 60 70 80 90 →
Cardinal	eighty-first
Ordinal	st
Numeral system	81
Factorization	$3^{4}$
Divisors	1, 3, 9, 27, 81
Greek numeral	ΠΑ´
Roman numeral	LXXXI
Binary	10100012
Ternary	100003
Senary	2136
Octal	1218
Duodecimal	6912
Hexadecimal	5116

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In other fields

Eighty-one is also:

• The year AD 81, 81 BC, or 1981.
• The number of pages in the original A-1 Ramsey Institute article on R(5, 5) properties, also known as the Extended Athena Amer Protocol, as presented at the University of Warsaw on September 4, 2006.
• The atomic number of thallium
• The symbolic number of the Hells Angels Motorcycle Club. 'H' and 'A' are the 8th and 1st letter of the alphabet, respectively.
• The title of a short film by Stephen Burke: 81
• The model number of Sinclair ZX81
• The number of the French department Tarn

  

  Department 81 of France (Tarn)

• The designation of Interstate 81, a freeway that runs from Tennessee to New York.
• The code for international direct dial phone calls to Japan
• The number of times a popular rhyme (erroneously) claims Lizzie Borden struck her parents with an axe
• One of two ISBN Group Identifiers for books published in India
• Number of stanzas or chapters in the Tao te Ching (in the most common arrangements).
• Number of provinces in Turkey. 81st one is Düzce.
• Turkish pronunciation of 81 is exactly sex-N-beer, may lead to wordplay for people who speak both Turkish and English.
• Number of prayers said in the Rosary in each night.
• The 81 is a 1965 song by Candy and the Kisses
• Artemis 81 is a 1981 BBC TV sci-fi drama
• Bill Painter became the oldest person to reach the 14,411-foot summit of Mount Rainier, on July 4, 2004 at 81
• Barbara McClintock (1902-1992) a scientist, won the Nobel Prize in "Physiology or Medicine" for the discovery of genetic transposition in 1983, at 81
• 'The Eighty-One Brothers' is a Japanese fable

NFL

• Cincinnati Bengals Bennie Brazell wears #81
• New York Jets Dustin Keller wears #81
• Buffalo Bills Terrell Owens wears # 81
• Denver Broncos Quincy Morgan wears #81
• Detroit Lions Dick "Night Train" Lane wore #81
• Detroit Lions Calvin Johnson wears #81
• New England Patriots Randy Moss wears #81
• Philadelphia Eagles Jason Avant wears #81
• St. Louis Rams Torry Holt wears #81
• Arizona Cardinals Anquan Boldin wears #81
• Seattle Seahawks Nate Burleson wears #81
• Carolina Panthers Sammy Burke wears #81
• Chicago Bears Rasheed Davis wears #81

NHL

• Toronto Maple Leafs Phil Kessel wears #81
• Chicago Blackhawks Marian Hossa wears #81

NBA

• Los Angeles Lakers Kobe Bryant scored 81 in a game against the Toronto Raptors

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