43

This number is a prime.

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The world's oldest known captive goldfish, Tish, died peacefully at home in his tank at the age of at least 43 in 1999. [Patterson]

The number of Carmichael numbers of six or fewer digits. [Patterson]

DSS-43 is a large steerable parabolic antenna in Tidbinbilla, Australia, which is a tidbit of trivia. [Patterson]

The only double-digit prime p such that (p!/(R(p))-1 is prime, i.e., (43!/34!)-1 = 204636013545599. [Patterson and Loungrides]