631989136 has 20 divisors (see below), whose sum is σ = 1229976832. Its totient is φ = 314575776.

The previous prime is 631989133. The next prime is 631989143.

631989136 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (631989131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84996 + ... + 92131.

Almost surely, 2^631989136 is an apocalyptic number.

It is an amenable number.

631989136 is a deficient number, since it is larger than the sum of its proper divisors (597987696).

631989136 is a wasteful number, since it uses less digits than its factorization.

631989136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177358 (or 177352 counting only the distinct ones).

The product of its digits is 209952, while the sum is 46.

The square root of 631989136 is about 25139.3941056661. The cubic root of 631989136 is about 858.1631681101.

The spelling of 631989136 in words is "six hundred thirty-one million, nine hundred eighty-nine thousand, one hundred thirty-six".