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 − 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 . the sum of two squares, 42 + 52. 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 centered square number. 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.