357 = 3 x 7 x 17.
357 is the only three-digit number such that 2*357357 - 1 is prime.
357 is the smallest three-digit number with its digits being three distinct odd primes that is not prime, nor do any of the permutations of its digits represent a prime number.
357 is the larger of the only two sphenic numbers (product of three distinct primes) consisting of three distinct prime digits.
357 is a divisor of 502 - 1.
