31516997212784 has 80 divisors (see below), whose sum is σ = 61647889996800. Its totient is φ = 15608674287360.

The previous prime is 31516997212781. The next prime is 31516997212793. The reversal of 31516997212784 is 48721279961513.

It is a super-2 number, since 2×31516997212784² (a number of 28 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 31516997212784.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31516997212781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1101863027 + ... + 1101891629.

It is an arithmetic number, because the mean of its divisors is an integer number (770598624960).

Almost surely, 2^{31516997212784} is an apocalyptic number.

It is an amenable number.

31516997212784 is a deficient number, since it is larger than the sum of its proper divisors (30130892784016).

31516997212784 is a wasteful number, since it uses less digits than its factorization.

31516997212784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30358 (or 30352 counting only the distinct ones).

The product of its digits is 45722880, while the sum is 65.

The spelling of 31516997212784 in words is "thirty-one trillion, five hundred sixteen billion, nine hundred ninety-seven million, two hundred twelve thousand, seven hundred eighty-four".