125351631 has 20 divisors (see below), whose sum is σ = 193297984. Its totient is φ = 80870400.

The previous prime is 125351599. The next prime is 125351647. The reversal of 125351631 is 136153521.

125351631 is a `hidden beast` number, since 1 + 25 + 3 + 5 + 1 + 631 = 666.

It is not a de Polignac number, because 125351631 - 2⁵ = 125351599 is a prime.

It is a super-2 number, since 2×125351631² = 31426062788720322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 125351595 and 125351604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125351131) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 22450 + ... + 27471.

Almost surely, 2^125351631 is an apocalyptic number.

125351631 is a deficient number, since it is larger than the sum of its proper divisors (67946353).

125351631 is an equidigital number, since it uses as much as digits as its factorization.

125351631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49964 (or 49955 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

The square root of 125351631 is about 11196.0542603187. The cubic root of 125351631 is about 500.4684023947.

The spelling of 125351631 in words is "one hundred twenty-five million, three hundred fifty-one thousand, six hundred thirty-one".