31918899336 has 48 divisors (see below), whose sum is σ = 83417572560. Its totient is φ = 10177036320.

The previous prime is 31918899263. The next prime is 31918899343. The reversal of 31918899336 is 63399881913.

It is a super-2 number, since 2×31918899336² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31918899336.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1244350 + ... + 1269741.

It is an arithmetic number, because the mean of its divisors is an integer number (1737866095).

Almost surely, 2^31918899336 is an apocalyptic number.

It is an amenable number.

31918899336 is an abundant number, since it is smaller than the sum of its proper divisors (51498673224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31918899336 is a wasteful number, since it uses less digits than its factorization.

31918899336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2514146 (or 2514119 counting only the distinct ones).

The product of its digits is 7558272, while the sum is 60.

The spelling of 31918899336 in words is "thirty-one billion, nine hundred eighteen million, eight hundred ninety-nine thousand, three hundred thirty-six".