631499313906 has 20 divisors (see below), whose sum is σ = 1415026240782. Its totient is φ = 210499771248.

The previous prime is 631499313889. The next prime is 631499313967. The reversal of 631499313906 is 609313994136.

631499313906 is a `hidden beast` number, since 6 + 31 + 499 + 31 + 3 + 90 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 607113680625 + 24385633281 = 779175^2 + 156159^2 .

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

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 9 ways as a sum of consecutive naturals, for example, 1949071795 + ... + 1949072118.

Almost surely, 2^631499313906 is an apocalyptic number.

631499313906 is an abundant number, since it is smaller than the sum of its proper divisors (783526926876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

631499313906 is a wasteful number, since it uses less digits than its factorization.

631499313906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3898143927 (or 3898143918 counting only the distinct ones).

The product of its (nonzero) digits is 2834352, while the sum is 54.

The spelling of 631499313906 in words is "six hundred thirty-one billion, four hundred ninety-nine million, three hundred thirteen thousand, nine hundred six".