56981515 has 16 divisors (see below), whose sum is σ = 69713280. Its totient is φ = 44703360.

The previous prime is 56981479. The next prime is 56981527. The reversal of 56981515 is 51518965.

56981515 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 56981515 - 2⁹ = 56981003 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 71097 + ... + 71893.

It is an arithmetic number, because the mean of its divisors is an integer number (4357080).

Almost surely, 2^56981515 is an apocalyptic number.

56981515 is a deficient number, since it is larger than the sum of its proper divisors (12731765).

56981515 is a wasteful number, since it uses less digits than its factorization.

56981515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1062.

The product of its digits is 54000, while the sum is 40.

The square root of 56981515 is about 7548.6101369722. The cubic root of 56981515 is about 384.8085065575.

The spelling of 56981515 in words is "fifty-six million, nine hundred eighty-one thousand, five hundred fifteen".