631881938125 has 20 divisors (see below), whose sum is σ = 789718384224. Its totient is φ = 505429550000.

The previous prime is 631881938087. The next prime is 631881938159. The reversal of 631881938125 is 521839188136.

631881938125 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 631881938125 - 2¹⁹ = 631881413837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4284360 + ... + 4429390.

Almost surely, 2^631881938125 is an apocalyptic number.

It is an amenable number.

631881938125 is a deficient number, since it is larger than the sum of its proper divisors (157836446099).

631881938125 is an equidigital number, since it uses as much as digits as its factorization.

631881938125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152022 (or 152007 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 55.

The spelling of 631881938125 in words is "six hundred thirty-one billion, eight hundred eighty-one million, nine hundred thirty-eight thousand, one hundred twenty-five".