31651256464 has 45 divisors (see below), whose sum is σ = 62220908883. Its totient is φ = 15597550176.

The previous prime is 31651256449. The next prime is 31651256467. The reversal of 31651256464 is 46465215613.

The square root of 31651256464 is 177908.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31651256464.

It is not an unprimeable number, because it can be changed into a prime (31651256467) 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 8 ways as a sum of consecutive naturals, for example, 56218647 + ... + 56219209.

Almost surely, 2^31651256464 is an apocalyptic number.

31651256464 is the 177908-th square number.

It is an amenable number.

31651256464 is a deficient number, since it is larger than the sum of its proper divisors (30569652419).

31651256464 is an frugal number, since it uses more digits than its factorization.

31651256464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1292 (or 644 counting only the distinct ones).

The product of its digits is 518400, while the sum is 43.

The spelling of 31651256464 in words is "thirty-one billion, six hundred fifty-one million, two hundred fifty-six thousand, four hundred sixty-four".