631312929 has 12 divisors (see below), whose sum is σ = 982042516. Its totient is φ = 388500192.

The previous prime is 631312909. The next prime is 631312931. The reversal of 631312929 is 929213136.

It is a happy number.

631312929 is a `hidden beast` number, since 631 + 3 + 12 + 9 + 2 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 46785600 + 584527329 = 6840^2 + 24177^2 .

It is not a de Polignac number, because 631312929 - 2⁸ = 631312673 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 631312893 and 631312902.

It is not an unprimeable number, because it can be changed into a prime (631312909) 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, 2697802 + ... + 2698035.

Almost surely, 2^631312929 is an apocalyptic number.

It is an amenable number.

631312929 is a deficient number, since it is larger than the sum of its proper divisors (350729587).

631312929 is a wasteful number, since it uses less digits than its factorization.

631312929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5395856 (or 5395853 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 631312929 is about 25125.9413554995. The cubic root of 631312929 is about 857.8569903627.

The spelling of 631312929 in words is "six hundred thirty-one million, three hundred twelve thousand, nine hundred twenty-nine".