41 (number)

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

In mathematics

 * the 13th smallest prime number. The next is 43, making both twin primes.
 * the sum of the first six prime numbers (2 + 3 + 5 + 7 + 11 + 13).
 * the 12th supersingular prime
 * a Newman–Shanks–Williams prime.
 * the smallest Sophie Germain prime to start a Cunningham chain of the first kind of three terms, {41, 83, 167}.
 * an Eisenstein prime, with no imaginary part and real part of the form 3n &minus; 1.
 * a Proth prime as it is 5 × 23 + 1.
 * the largest lucky number of Euler: the polynomial yields primes for all the integers k with 1 ≤ k < 41.
 * the sum of two squares (42 + 52), which makes it a centered square number.
 * the sum of the first three Mersenne primes, 3, 7, 31.
 * the sum of the sum of the divisors of the first 7 positive integers.
 * the smallest integer whose reciprocal has a 5-digit repetend. That is a consequence of the fact that 41 is a factor of 99999.
 * the smallest integer whose square root has a continued fraction with period 3.
 * a prime index prime, as 13 is prime.

In science

 * The atomic number of niobium.

In 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.

In music

 * "#41", a song by Dave Matthews Band.
 * "American Skin (41 Shots)" is a song by Bruce Springsteen about an immigrant murder victim who was shot at 41 times by the NYPD.

In film

 * The name of an independent documentary about Nicholas O'Neill, the youngest victim of the Station nightclub fire.
 * 2012 documentary on the life of the 41st President of the United States George H. W. Bush.

In other fields

 * The international direct dialing (IDD) code for Switzerland.
 * Bush 41, George H. W. Bush, the 41st President of the United States.
 * 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
 * Number of ballistic missile submarines of the George Washington class and its successors, collectively known as the "41 for Freedom".
 * The 41st season of CBS's reality program Survivor is simply subtitled Survivor 41.