56981613 has 16 divisors (see below), whose sum is σ = 82071360. Its totient is φ = 34957824.

The previous prime is 56981611. The next prime is 56981633. The reversal of 56981613 is 31618965.

It is not a de Polignac number, because 56981613 - 2¹ = 56981611 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56981611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11698 + ... + 15836.

It is an arithmetic number, because the mean of its divisors is an integer number (5129460).

Almost surely, 2^56981613 is an apocalyptic number.

It is an amenable number.

56981613 is a deficient number, since it is larger than the sum of its proper divisors (25089747).

56981613 is a wasteful number, since it uses less digits than its factorization.

56981613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4508.

The product of its digits is 38880, while the sum is 39.

The square root of 56981613 is about 7548.6166282306. The cubic root of 56981613 is about 384.8087271625.

The spelling of 56981613 in words is "fifty-six million, nine hundred eighty-one thousand, six hundred thirteen".