31613613 has 4 divisors (see below), whose sum is σ = 42151488. Its totient is φ = 21075740.

The previous prime is 31613581. The next prime is 31613623. The reversal of 31613613 is 31631613.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31613613 - 2⁵ = 31613581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31613623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5268933 + ... + 5268938.

It is an arithmetic number, because the mean of its divisors is an integer number (10537872).

Almost surely, 2^31613613 is an apocalyptic number.

It is an amenable number.

31613613 is a deficient number, since it is larger than the sum of its proper divisors (10537875).

31613613 is a wasteful number, since it uses less digits than its factorization.

31613613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10537874.

The product of its digits is 972, while the sum is 24.

The square root of 31613613 is about 5622.5984206593. The cubic root of 31613613 is about 316.1972177270.

The spelling of 31613613 in words is "thirty-one million, six hundred thirteen thousand, six hundred thirteen".