Adding to 2231 its reverse (1322), we get a palindrome (3553).
Subtracting from 2231 its reverse (1322), we obtain a palindrome (909).
It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1322 = 2 ⋅661.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-2231 is a prime.
It is a Duffinian number.
It is a plaindrome in base 12.
It is a nialpdrome in base 14.
It is a congruent number.
22231 is an apocalyptic number.
2231 is an equidigital number, since it uses as much as digits as its factorization.
2231 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 120.
The square root of 2231 is about 47.2334627145. The cubic root of 2231 is about 13.0667181496.
The spelling of 2231 in words is "two thousand, two hundred thirty-one".