41

This number is a prime.

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The sixth prime digit sum of the contiguously concatenated digits of the Copeland-Erdős Constant, (i.e., 0.2357111317192...) has SOD(235711131719) = 41, and is the smallest such sum to have an adjacent sum of digits similarly formed, i.e., SOD(2357111317192) = 43, which is only a single-digit longer. Note that {41, 43} are twin primes. [Harrison]

The last surviving astro-chimpanzee, Minnie, died on a Pi Day at age 41. [Harrison]

(There are 2 curios for this number that have not yet been approved by an editor.)