631625139 has 24 divisors (see below), whose sum is σ = 923843232. Its totient is φ = 415806720.

The previous prime is 631625119. The next prime is 631625161. The reversal of 631625139 is 931526136.

631625139 is a `hidden beast` number, since 631 + 6 + 2 + 5 + 13 + 9 = 666.

It is not a de Polignac number, because 631625139 - 2⁸ = 631624883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (631625119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 315289 + ... + 317285.

It is an arithmetic number, because the mean of its divisors is an integer number (38493468).

Almost surely, 2^631625139 is an apocalyptic number.

631625139 is a deficient number, since it is larger than the sum of its proper divisors (292218093).

631625139 is a wasteful number, since it uses less digits than its factorization.

631625139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2427 (or 2424 counting only the distinct ones).

The product of its digits is 29160, while the sum is 36.

The square root of 631625139 is about 25132.1534891063. The cubic root of 631625139 is about 857.9983821509.

The spelling of 631625139 in words is "six hundred thirty-one million, six hundred twenty-five thousand, one hundred thirty-nine".