315613881 has 16 divisors (see below), whose sum is σ = 510083520. Its totient is φ = 191280960.

The previous prime is 315613877. The next prime is 315613919. The reversal of 315613881 is 188316513.

315613881 is a `hidden beast` number, since 31 + 5 + 613 + 8 + 8 + 1 = 666.

It is not a de Polignac number, because 315613881 - 2² = 315613877 is a prime.

It is a super-2 number, since 2×315613881² = 199224243759764322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (315613481) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 531040 + ... + 531633.

It is an arithmetic number, because the mean of its divisors is an integer number (31880220).

Almost surely, 2^315613881 is an apocalyptic number.

It is an amenable number.

315613881 is a deficient number, since it is larger than the sum of its proper divisors (194469639).

315613881 is a wasteful number, since it uses less digits than its factorization.

315613881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1062693 (or 1062687 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 315613881 is about 17765.5250696398. The cubic root of 315613881 is about 680.8509250821.

The spelling of 315613881 in words is "three hundred fifteen million, six hundred thirteen thousand, eight hundred eighty-one".