12531231 has 12 divisors (see below), whose sum is σ = 18133752. Its totient is φ = 8338896.

The previous prime is 12531221. The next prime is 12531247. The reversal of 12531231 is 13213521.

It is not a de Polignac number, because 12531231 - 2¹⁴ = 12514847 is a prime.

It is a super-2 number, since 2×12531231² = 314063500750722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12531221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6300 + ... + 8046.

It is an arithmetic number, because the mean of its divisors is an integer number (1511146).

Almost surely, 2^12531231 is an apocalyptic number.

12531231 is a deficient number, since it is larger than the sum of its proper divisors (5602521).

12531231 is a wasteful number, since it uses less digits than its factorization.

12531231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2550 (or 2547 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 12531231 is about 3539.9478809723. The cubic root of 12531231 is about 232.2725628812.

Adding to 12531231 its reverse (13213521), we get a palindrome (25744752).

The spelling of 12531231 in words is "twelve million, five hundred thirty-one thousand, two hundred thirty-one".