631886913 has 40 divisors (see below), whose sum is σ = 1083633408. Its totient is φ = 359453376.

The previous prime is 631886891. The next prime is 631886921. The reversal of 631886913 is 319688136.

It is a happy number.

631886913 is a `hidden beast` number, since 631 + 8 + 8 + 6 + 9 + 1 + 3 = 666.

It is not a de Polignac number, because 631886913 - 2⁸ = 631886657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (631886953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 129720 + ... + 134502.

Almost surely, 2^631886913 is an apocalyptic number.

631886913 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

It is an amenable number.

631886913 is a deficient number, since it is larger than the sum of its proper divisors (451746495).

631886913 is a wasteful number, since it uses less digits than its factorization.

631886913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5035 (or 5026 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 631886913 is about 25137.3608996649. The cubic root of 631886913 is about 858.1168968803.

The spelling of 631886913 in words is "six hundred thirty-one million, eight hundred eighty-six thousand, nine hundred thirteen".