31421152656 has 90 divisors (see below), whose sum is σ = 91925326038. Its totient is φ = 10018314240.

The previous prime is 31421152627. The next prime is 31421152681. The reversal of 31421152656 is 65625112413.

31421152656 is a `hidden beast` number, since 31 + 42 + 11 + 526 + 56 = 666.

It can be written as a sum of positive squares in only one way, i.e., 31299271056 + 121881600 = 176916^2 + 11040^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 31421152656.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 130065 + ... + 282416.

Almost surely, 2^31421152656 is an apocalyptic number.

31421152656 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

31421152656 is an abundant number, since it is smaller than the sum of its proper divisors (60504173382).

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

31421152656 is a wasteful number, since it uses less digits than its factorization.

31421152656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412541 (or 412509 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The spelling of 31421152656 in words is "thirty-one billion, four hundred twenty-one million, one hundred fifty-two thousand, six hundred fifty-six".