12689631 has 24 divisors (see below), whose sum is σ = 19206720. Its totient is φ = 8064576.

The previous prime is 12689627. The next prime is 12689639. The reversal of 12689631 is 13698621.

12689631 is a `hidden beast` number, since 12 + 6 + 8 + 9 + 631 = 666.

12689631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12689631 - 2² = 12689627 is a prime.

It is a super-2 number, since 2×12689631² = 322053469832322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12689639) 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, 17290 + ... + 18008.

It is an arithmetic number, because the mean of its divisors is an integer number (800280).

Almost surely, 2^12689631 is an apocalyptic number.

12689631 is a deficient number, since it is larger than the sum of its proper divisors (6517089).

12689631 is a wasteful number, since it uses less digits than its factorization.

12689631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815 (or 812 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 12689631 is about 3562.2508333917. The cubic root of 12689631 is about 233.2471420885.

The spelling of 12689631 in words is "twelve million, six hundred eighty-nine thousand, six hundred thirty-one".