125531631 has 12 divisors (see below), whose sum is σ = 189207408. Its totient is φ = 80049024.

The previous prime is 125531579. The next prime is 125531641. The reversal of 125531631 is 136135521.

125531631 is a `hidden beast` number, since 1 + 25 + 5 + 3 + 1 + 631 = 666.

It is not a de Polignac number, because 125531631 - 2¹⁰ = 125530607 is a prime.

It is a super-2 number, since 2×125531631² = 31516380763040322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 125531595 and 125531604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125531641) 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, 303010 + ... + 303423.

It is an arithmetic number, because the mean of its divisors is an integer number (15767284).

Almost surely, 2^125531631 is an apocalyptic number.

125531631 is a deficient number, since it is larger than the sum of its proper divisors (63675777).

125531631 is a wasteful number, since it uses less digits than its factorization.

125531631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606462 (or 606459 counting only the distinct ones).

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

The square root of 125531631 is about 11204.0899228808. The cubic root of 125531631 is about 500.7078387890.

The spelling of 125531631 in words is "one hundred twenty-five million, five hundred thirty-one thousand, six hundred thirty-one".