631918994 has 24 divisors (see below), whose sum is σ = 1109962368. Its totient is φ = 269022600.

The previous prime is 631918949. The next prime is 631919011. The reversal of 631918994 is 499819136.

It is a super-2 number, since 2×631918994² = 798643229955944072, which contains 22 as substring.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 6554 + ... + 36149.

It is an arithmetic number, because the mean of its divisors is an integer number (46248432).

Almost surely, 2^631918994 is an apocalyptic number.

631918994 is a deficient number, since it is larger than the sum of its proper divisors (478043374).

631918994 is a wasteful number, since it uses less digits than its factorization.

631918994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42870 (or 42863 counting only the distinct ones).

The product of its digits is 419904, while the sum is 50.

The square root of 631918994 is about 25137.9990054897. Note that the first 3 decimals coincide. The cubic root of 631918994 is about 858.1314188788.

Adding to 631918994 its sum of digits (50), we get a square (631919044 = 25138²).

The spelling of 631918994 in words is "six hundred thirty-one million, nine hundred eighteen thousand, nine hundred ninety-four".