41 (number)

← 40 41 42 →
← 40 41 42 43 44 45 46 47 48 49 → List of numbers Integers ← 0 10 20 30 40 50 60 70 80 90 →
Cardinal	forty-one
Ordinal	st
Factorization	prime
Divisors	1, 41
Greek numeral	ΜΑ´
Roman numeral	XLI
Binary	1010012
Ternary	11123
Senary	1056
Octal	518
Duodecimal	3512
Hexadecimal	2916

41 (forty-one) is the natural number following 40 and preceding 42.

In mathematics

Forty-one is the 13th smallest prime number. The next is forty-three, with which it comprises a twin prime. It is also the sum of the first six prime numbers (2 + 3 + 5 + 7 + 11 + 13), and the sum of three primes (11 + 13 + 17).

Forty-one is also the 12th supersingular prime, a Sophie Germain prime and a Newman-Shanks-Williams prime. 41 is the smallest Sophie Germain prime to start a Cunningham chain of the first kind of three terms, {41, 83, 167}. It is an Eisenstein prime, with no imaginary part and real part of the form $3n-1$. 41 is a Proth prime as it is 5 × 2³ + 1.

The number figures in the polynomial f(n) = n² + n + 41, which yields primes for -40 ≤ n < 40.

Forty-one is the sum of two squares, 4² + 5². Adding up the sums of divisors for 1 through 7 yields 41.

It is a centered square number.

In science

• The atomic number of niobium.

Astronomy

• Messier object M41, a magnitude 5.0 open cluster in the constellation Canis Major
• The New General Catalogue object NGC 41, a spiral galaxy in the constellation Pegasus
• The Saros number of the solar eclipse series which began on May 28 1588 BC and ended on July 5 308 BC. The duration of Saros series 41 was 1280.1 years, and it contained 72 solar eclipses.
• The Saros number of the lunar eclipse series which began on March 18 1268 BC and ended on May 6 AD 30. The duration of Saros series 41 was 1298.1 years, and it contained 73 lunar eclipses.

In music

• the number of the last symphony of Wolfgang Amadeus Mozart (note: '37' is not in the canon)
• "#41", a song by Dave Matthews Band
• the band Sum 41
• the number of times Paul McCartney sings the phrase "Let It Be" in the Beatles #1 hit Let It Be (song)

In film

• The name of an independent documentary about Nicholas O'Neill, the youngest victim of the Station nightclub fire.

In sports

• The retired number of the back of the uniform worn by Hall of Famers Tom Seaver of the New York Mets and by Eddie Mathews of the Atlanta Braves.
• Worn by and retired for Brian Piccolo, running back for the Chicago Bears. Died June 16, 1970 of embryonal cell carcinoma.
• Worn by Dallas Mavericks Power Forward Dirk Nowitzki
• Jersey number of Finnish icehockey legend Raimo Helminen since 1996.
• Reed Sorenson's Nascar Nextel Cup number.
• Worn by Ian Johnson: Running back from Boise State.
• Worn by All-Star athlete Phillip Cheesman from Hopson Elite.

In Religion

• In Christianity, 41 represents the 39 lashes Jesus Christ received before the crucifixion, plus one for the spear in His side, plus one for the crown of thorns.

In other fields

Forty-one is also:

• the model number of the HP-41C/CV/CX
• a number frequently referred to in Arthur C. Clarke's series of books known as the Rama Cycle. Michael O'Toole's password for the Trinity operation is heavily encoded with the number 41. Also the virus that exists on New Eden is known as RV-41.
• the international direct dialing (IDD) code for Switzerland.
• Charlton Heston's designation as a galley slave in the film Ben-Hur.
• C-41 process is the film developing process for 35mm color negative film.
• The code number given to Tetsuo Shima by scientists in the manga and 1988 film Akira
• Jonathan Pryce's destination level for his apartment in Terry Gilliam's Brazil
• Billy Cole's jersey number in the Tony Scott film The Last Boy Scout
• George W. Bush's nickname for his father, George H. W. Bush, the 41st President of the United States
• Montana is the 41st state of the United States.
• In the feature film The Matrix, Morpheus is aggressively questioned in the 41st floor of the government building, in reference to the murder of Amadou Diallo.
• In the 1994 arcade game Daytona USA, the player racing team, Team Hornet, has a race number of 41. It is also continued in the 1998 arcade game Daytona USA 2, where it is applied to three more player cars. The number 41 does not appear on the player cars on linked cabinets for both games.
• In Mexico cuarenta y uno (41) is slang referring to a homosexual. This is due to the 1901 arrest of 41 homosexuals at a hotel in Mexico City during the government of Porfirio Díaz (1876-1911). See: Dance of the Forty-One (Reference 1) (Reference 2)
• The victim number that appears on Dr. Lucy Lynskey's forehead in the Peter Jackson film The Frighteners.
• The precinct number that appears on the NYC police car in the film Ghostbusters during the earthquake moment of the film's climax.
• Municipal Okrug #41, name of Konstantinovskoye Municipal Okrug of Krasnoselsky District of Saint Petersburg, Russia, before 2008
• The number of the French department Loir-et-Cher

Historical years

41 A.D., 41 B.C., 1941, 2041, etc.