31897684546 has 96 divisors (see below), whose sum is σ = 63385459200. Its totient is φ = 11913350400.

The previous prime is 31897684541. The next prime is 31897684547. The reversal of 31897684546 is 64548679813.

It is a happy number.

It is a super-2 number, since 2×31897684546² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31897684541) 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 47 ways as a sum of consecutive naturals, for example, 1609405 + ... + 1629103.

It is an arithmetic number, because the mean of its divisors is an integer number (660265200).

Almost surely, 2^31897684546 is an apocalyptic number.

31897684546 is a deficient number, since it is larger than the sum of its proper divisors (31487774654).

31897684546 is a wasteful number, since it uses less digits than its factorization.

31897684546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19800 (or 19793 counting only the distinct ones).

The product of its digits is 34836480, while the sum is 61.

The spelling of 31897684546 in words is "thirty-one billion, eight hundred ninety-seven million, six hundred eighty-four thousand, five hundred forty-six".