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

ajqwaftgfasgefrtsahqgete yytryrgqgfaqewted twfsfsfdsdaqdwegfbgghnggbgnh ashaly and ellie yazmeen katlen

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

In Culture

The Arabic numerals for 81 are visible in the left palm of the human hand. In China, 81 always reminds people People's Liberation Army as it was founded on August 1.