56015539 has 2 divisors, whose sum is σ = 56015540. Its totient is φ = 56015538.

The previous prime is 56015489. The next prime is 56015563. The reversal of 56015539 is 93551065.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56015539 - 2¹¹ = 56013491 is a prime.

It is not a weakly prime, because it can be changed into another prime (56015599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28007769 + 28007770.

It is an arithmetic number, because the mean of its divisors is an integer number (28007770).

Almost surely, 2^56015539 is an apocalyptic number.

56015539 is a deficient number, since it is larger than the sum of its proper divisors (1).

56015539 is an equidigital number, since it uses as much as digits as its factorization.

56015539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20250, while the sum is 34.

The square root of 56015539 is about 7484.3529446439. The cubic root of 56015539 is about 382.6216202315.

Subtracting from 56015539 its product of nonzero digits (20250), we obtain a square (55995289 = 7483²).

The spelling of 56015539 in words is "fifty-six million, fifteen thousand, five hundred thirty-nine".