631138091364 has 81 divisors (see below), whose sum is σ = 1753741728921. Its totient is φ = 191238078240.

The previous prime is 631138091347. The next prime is 631138091387. The reversal of 631138091364 is 463190831136.

It is a happy number.

The square root of 631138091364 is 794442.

It is a perfect power (a square), and thus also a powerful number.

631138091364 is a `hidden beast` number, since 631 + 1 + 3 + 8 + 0 + 9 + 1 + 3 + 6 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 5127992100 + 626010099264 = 71610^2 + 791208^2 .

It is a super-2 number, since 2×631138091364² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 52427154 + ... + 52439190.

Almost surely, 2^631138091364 is an apocalyptic number.

631138091364 is the 794442-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 631138091364

631138091364 is an abundant number, since it is smaller than the sum of its proper divisors (1122603637557).

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

631138091364 is a wasteful number, since it uses less digits than its factorization.

631138091364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24106 (or 12053 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The spelling of 631138091364 in words is "six hundred thirty-one billion, one hundred thirty-eight million, ninety-one thousand, three hundred sixty-four".