2537 = 43 x 59.
2537 is a semiprime with distinct prime digits (A108632).
2537 is the smallest number that can be expressed as the sum of a prime number and a nonzero square in just 20 different ways (A064283).
2537 is the sum of all the primes raised to their corresponding powers: 2537 = 21 + 32 + 53 + 74 (A087480).
2537 is a composite number such that exactly eight distinct permutations of digits give primes (A163560).
Source: On-Line Encyclopedia of Integer Sequences