31218773315316 has 24 divisors (see below), whose sum is σ = 72844099429920. Its totient is φ = 10406215624992.

The previous prime is 31218773315297. The next prime is 31218773315329. The reversal of 31218773315316 is 61351337781213.

It is a super-2 number, since 2×31218773315316² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2106111 + ... + 8177606.

It is an arithmetic number, because the mean of its divisors is an integer number (3035170809580).

Almost surely, 2^{31218773315316} is an apocalyptic number.

It is an amenable number.

31218773315316 is an abundant number, since it is smaller than the sum of its proper divisors (41625326114604).

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

31218773315316 is a wasteful number, since it uses less digits than its factorization.

31218773315316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10536703 (or 10536701 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 51.

The spelling of 31218773315316 in words is "thirty-one trillion, two hundred eighteen billion, seven hundred seventy-three million, three hundred fifteen thousand, three hundred sixteen".