963 = 3 x 3 x 107.
963 is the sum of the first 24 primes (A007504). It is the smallest composite number that is a sum of 24 distinct primes (A073619).
963 is a number n such that the digits of n2 (927369), reversed, include the digits of n as a substring (A115761).
963 and 964 both have six divisors (A049103).
963 is the sum of two consecutive semiprimes (A173966): 963 = 478 + 485.
Source: On-Line Encyclopedia of Integer Sequences