12131631 has 12 divisors (see below), whose sum is σ = 17592120. Its totient is φ = 8056080.

The previous prime is 12131629. The next prime is 12131641. The reversal of 12131631 is 13613121.

12131631 is a `hidden beast` number, since 1 + 2 + 1 + 31 + 631 = 666.

It is not a de Polignac number, because 12131631 - 2¹ = 12131629 is a prime.

It is a super-2 number, since 2×12131631² = 294352941440322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12131621) 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, 85 + ... + 4926.

It is an arithmetic number, because the mean of its divisors is an integer number (1466010).

Almost surely, 2^12131631 is an apocalyptic number.

12131631 is a deficient number, since it is larger than the sum of its proper divisors (5460489).

12131631 is a wasteful number, since it uses less digits than its factorization.

12131631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5286 (or 5283 counting only the distinct ones).

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

The square root of 12131631 is about 3483.0490952612. The cubic root of 12131631 is about 229.7769166505.

Adding to 12131631 its reverse (13613121), we get a palindrome (25744752).

The spelling of 12131631 in words is "twelve million, one hundred thirty-one thousand, six hundred thirty-one".