31997182816 has 48 divisors (see below), whose sum is σ = 63576204048. Its totient is φ = 15851520000.

The previous prime is 31997182787. The next prime is 31997182817. The reversal of 31997182816 is 61828179913.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31997182817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1539856 + ... + 1560496.

It is an arithmetic number, because the mean of its divisors is an integer number (1324504251).

Almost surely, 2^31997182816 is an apocalyptic number.

It is an amenable number.

31997182816 is a deficient number, since it is larger than the sum of its proper divisors (31579021232).

31997182816 is a wasteful number, since it uses less digits than its factorization.

31997182816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21095 (or 21087 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 55.

The spelling of 31997182816 in words is "thirty-one billion, nine hundred ninety-seven million, one hundred eighty-two thousand, eight hundred sixteen".