125981631 has 12 divisors (see below), whose sum is σ = 182072800. Its totient is φ = 83941920.

The previous prime is 125981599. The next prime is 125981651. The reversal of 125981631 is 136189521.

125981631 is a `hidden beast` number, since 1 + 2 + 598 + 1 + 63 + 1 = 666.

It is not a de Polignac number, because 125981631 - 2⁵ = 125981599 is a prime.

It is a super-2 number, since 2×125981631² = 31742742698840322, 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 (125981651) 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, 25146 + ... + 29736.

Almost surely, 2^125981631 is an apocalyptic number.

125981631 is a deficient number, since it is larger than the sum of its proper divisors (56091169).

125981631 is a wasteful number, since it uses less digits than its factorization.

125981631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7646 (or 7643 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 125981631 is about 11224.1539102063. The cubic root of 125981631 is about 501.3054300718.

The spelling of 125981631 in words is "one hundred twenty-five million, nine hundred eighty-one thousand, six hundred thirty-one".