12331231 has 12 divisors (see below), whose sum is σ = 13644736. Its totient is φ = 11135520.

The previous prime is 12331223. The next prime is 12331237. The reversal of 12331231 is 13213321.

It is not a de Polignac number, because 12331231 - 2³ = 12331223 is a prime.

It is a super-2 number, since 2×12331231² = 304118515950722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12331237) 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, 26755 + ... + 27211.

Almost surely, 2^12331231 is an apocalyptic number.

12331231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12331231 is a deficient number, since it is larger than the sum of its proper divisors (1313505).

12331231 is a wasteful number, since it uses less digits than its factorization.

12331231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702 (or 691 counting only the distinct ones).

The product of its digits is 108, while the sum is 16.

The square root of 12331231 is about 3511.5852545538. The cubic root of 12331231 is about 231.0302303596.

Adding to 12331231 its reverse (13213321), we get a palindrome (25544552).

The spelling of 12331231 in words is "twelve million, three hundred thirty-one thousand, two hundred thirty-one".