- 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 f(k) = k2 − k + 41 yields primes for all the integers k with 1 ≤ k < 41.
- 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.[5]
- a prime index prime, as 13 is prime.
- The percentage of transgender people who have attempted suicide at some point in their life.[15][16] Written as "41%" and often used both as a synonym for suicide within transgender communities, and as general shorthand for transgender people in right-wing and alt-right online communities.
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