12231 has 10 divisors (see below), whose sum is σ = 18392. Its totient is φ = 8100.

The previous prime is 12227. The next prime is 12239. The reversal of 12231 is 13221.

It is a happy number.

It is not a de Polignac number, because 12231 - 2² = 12227 is a prime.

It is a super-2 number, since 2×12231² = 299194722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12239) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 6 + ... + 156.

2¹²²³¹ is an apocalyptic number.

12231 is a deficient number, since it is larger than the sum of its proper divisors (6161).

12231 is an equidigital number, since it uses as much as digits as its factorization.

12231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163 (or 154 counting only the distinct ones).

The product of its digits is 12, while the sum is 9.

The square root of 12231 is about 110.5938515470. The cubic root of 12231 is about 23.0402571586.

Adding to 12231 its reverse (13221), we get a palindrome (25452).

Subtracting 12231 from its reverse (13221), we obtain a triangular number (990 = T₄₄).

It can be divided in two parts, 122 and 31, that added together give a triangular number (153 = T₁₇).

The spelling of 12231 in words is "twelve thousand, two hundred thirty-one".