631161988 has 12 divisors (see below), whose sum is σ = 1162666960. Its totient is φ = 298971432.

The previous prime is 631161977. The next prime is 631161989. The reversal of 631161988 is 889161136.

It is a happy number.

It is a super-2 number, since 2×631161988² = 796730910192224288, which contains 22 as substring.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (631161989) 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 3 ways as a sum of consecutive naturals, for example, 4152306 + ... + 4152457.

Almost surely, 2^631161988 is an apocalyptic number.

It is an amenable number.

631161988 is a deficient number, since it is larger than the sum of its proper divisors (531504972).

631161988 is a wasteful number, since it uses less digits than its factorization.

631161988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8304786 (or 8304784 counting only the distinct ones).

The product of its digits is 62208, while the sum is 43.

The square root of 631161988 is about 25122.9374874834. The cubic root of 631161988 is about 857.7886163931.

The spelling of 631161988 in words is "six hundred thirty-one million, one hundred sixty-one thousand, nine hundred eighty-eight".