12311631 has 24 divisors (see below), whose sum is σ = 18841680. Its totient is φ = 7733376.

The previous prime is 12311627. The next prime is 12311641. The reversal of 12311631 is 13611321.

12311631 is a `hidden beast` number, since 1 + 2 + 31 + 1 + 631 = 666.

It is not a de Polignac number, because 12311631 - 2² = 12311627 is a prime.

It is a super-2 number, since 2×12311631² = 303152515760322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12311641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10675 + ... + 11771.

It is an arithmetic number, because the mean of its divisors is an integer number (785070).

Almost surely, 2^12311631 is an apocalyptic number.

12311631 is a deficient number, since it is larger than the sum of its proper divisors (6530049).

12311631 is a wasteful number, since it uses less digits than its factorization.

12311631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1175 (or 1172 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 12311631 is about 3508.7933823467. The cubic root of 12311631 is about 230.9077610035.

Adding to 12311631 its reverse (13611321), we get a palindrome (25922952).

The spelling of 12311631 in words is "twelve million, three hundred eleven thousand, six hundred thirty-one".