31875631625 has 8 divisors (see below), whose sum is σ = 39780788424. Its totient is φ = 25500505200.

The previous prime is 31875631607. The next prime is 31875631681. The reversal of 31875631625 is 52613657813.

It can be written as a sum of positive squares in 4 ways, for example, as 1753599376 + 30122032249 = 41876^2 + 173557^2 .

It is not a de Polignac number, because 31875631625 - 2⁸ = 31875631369 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31875631625.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127502402 + ... + 127502651.

It is an arithmetic number, because the mean of its divisors is an integer number (4972598553).

Almost surely, 2^31875631625 is an apocalyptic number.

It is an amenable number.

31875631625 is a deficient number, since it is larger than the sum of its proper divisors (7905156799).

31875631625 is an equidigital number, since it uses as much as digits as its factorization.

31875631625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255005068 (or 255005058 counting only the distinct ones).

The product of its digits is 907200, while the sum is 47.

The spelling of 31875631625 in words is "thirty-one billion, eight hundred seventy-five million, six hundred thirty-one thousand, six hundred twenty-five".