237

237 = 3 x 79.

237 is a number n such that n² + 2 is a prime: 237² + 2 = 56171.

237 is the smallest three-digit number with its digits being three distinct primes that is itself not prime and none of the permutations of its digits represents a prime number.

237 is the smallest number with the property that its first three multiples contain the digit 7: 237, 474, and 711.

Room 237 plays a significant role in the Stanley Kubrick film The Shining.

Source: Prime Curios!