31213120986 has 32 divisors (see below), whose sum is σ = 69385828800. Its totient is φ = 10400873040.

The previous prime is 31213120951. The next prime is 31213120999. The reversal of 31213120986 is 68902131213.

31213120986 is a `hidden beast` number, since 312 + 131 + 209 + 8 + 6 = 666.

It is a super-2 number, since 2×31213120986² (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 31213120986.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67296 + ... + 258756.

It is an arithmetic number, because the mean of its divisors is an integer number (2168307150).

Almost surely, 2^31213120986 is an apocalyptic number.

31213120986 is an abundant number, since it is smaller than the sum of its proper divisors (38172707814).

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

31213120986 is a wasteful number, since it uses less digits than its factorization.

31213120986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194491 (or 194485 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The spelling of 31213120986 in words is "thirty-one billion, two hundred thirteen million, one hundred twenty thousand, nine hundred eighty-six".