31951591368 has 32 divisors (see below), whose sum is σ = 79885496160. Its totient is φ = 10649661440.

The previous prime is 31951591339. The next prime is 31951591369. The reversal of 31951591368 is 86319515913.

It is a super-2 number, since 2×31951591368² (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 31951591368.

It is not an unprimeable number, because it can be changed into a prime (31951591369) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 290671 + ... + 385217.

It is an arithmetic number, because the mean of its divisors is an integer number (2496421755).

Almost surely, 2^31951591368 is an apocalyptic number.

It is an amenable number.

31951591368 is an abundant number, since it is smaller than the sum of its proper divisors (47933904792).

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

31951591368 is a wasteful number, since it uses less digits than its factorization.

31951591368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108637 (or 108633 counting only the distinct ones).

The product of its digits is 874800, while the sum is 51.

The spelling of 31951591368 in words is "thirty-one billion, nine hundred fifty-one million, five hundred ninety-one thousand, three hundred sixty-eight".