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For the year A.D. 41, see 41.

Forty-one (41, LXI) is the natural number following forty and preceding forty-two.

Forty-one is the 13th smallest prime number. The next is forty-three, with which it comprises a twin prime. The number figures in the polynomial f(n) = n2 - n + 41, which yields primes for 0 < n < 41. Forty-one in the sum of two squares, 42 + 52, as well as the sum of the first six prime numbers, and also the sum of three primes (11 + 13 + 17).

Forty-one is also: