125021631 has 16 divisors (see below), whose sum is σ = 195659264. Its totient is φ = 69509664.

The previous prime is 125021609. The next prime is 125021681. The reversal of 125021631 is 136120521.

It is not a de Polignac number, because 125021631 - 2⁵ = 125021599 is a prime.

It is a super-2 number, since 2×125021631² = 31260816435800322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 125021598 and 125021607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125021681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79675 + ... + 81228.

It is an arithmetic number, because the mean of its divisors is an integer number (12228704).

Almost surely, 2^125021631 is an apocalyptic number.

125021631 is a deficient number, since it is larger than the sum of its proper divisors (70637633).

125021631 is a wasteful number, since it uses less digits than its factorization.

125021631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160950.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 125021631 is about 11181.3072133807. The cubic root of 125021631 is about 500.0288396698.

The spelling of 125021631 in words is "one hundred twenty-five million, twenty-one thousand, six hundred thirty-one".