631372905 has 12 divisors (see below), whose sum is σ = 1094379780. Its totient is φ = 336732192.

The previous prime is 631372879. The next prime is 631372909. The reversal of 631372905 is 509273136.

It can be written as a sum of positive squares in 2 ways, for example, as 66977856 + 564395049 = 8184^2 + 23757^2 .

It is not a de Polignac number, because 631372905 - 2²⁰ = 630324329 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 631372905.

It is not an unprimeable number, because it can be changed into a prime (631372909) 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, 7015210 + ... + 7015299.

It is an arithmetic number, because the mean of its divisors is an integer number (91198315).

Almost surely, 2^631372905 is an apocalyptic number.

It is an amenable number.

631372905 is a deficient number, since it is larger than the sum of its proper divisors (463006875).

631372905 is a wasteful number, since it uses less digits than its factorization.

631372905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14030520 (or 14030517 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 36.

The square root of 631372905 is about 25127.1348346762. The cubic root of 631372905 is about 857.8841555499.

The spelling of 631372905 in words is "six hundred thirty-one million, three hundred seventy-two thousand, nine hundred five".