125451021631 has 16 divisors (see below), whose sum is σ = 145237478400. Its totient is φ = 107371973088.

The previous prime is 125451021599. The next prime is 125451021659. The reversal of 125451021631 is 136120154521.

It is a cyclic number.

It is not a de Polignac number, because 125451021631 - 2⁵ = 125451021599 is a prime.

It is a super-2 number, since 2×125451021631² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 125451021593 and 125451021602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125451021431) 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, 5391571 + ... + 5414788.

It is an arithmetic number, because the mean of its divisors is an integer number (9077342400).

Almost surely, 2^125451021631 is an apocalyptic number.

125451021631 is a deficient number, since it is larger than the sum of its proper divisors (19786456769).

125451021631 is a wasteful number, since it uses less digits than its factorization.

125451021631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10806438.

The product of its (nonzero) digits is 7200, while the sum is 31.

The spelling of 125451021631 in words is "one hundred twenty-five billion, four hundred fifty-one million, twenty-one thousand, six hundred thirty-one".