56515387 has 4 divisors (see below), whose sum is σ = 58338496. Its totient is φ = 54692280.

The previous prime is 56515369. The next prime is 56515397. The reversal of 56515387 is 78351565.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78351565 = 5 ⋅15670313.

It is a cyclic number.

It is not a de Polignac number, because 56515387 - 2¹⁹ = 55991099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56515307) 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 3 ways as a sum of consecutive naturals, for example, 911508 + ... + 911569.

It is an arithmetic number, because the mean of its divisors is an integer number (14584624).

Almost surely, 2^56515387 is an apocalyptic number.

56515387 is a deficient number, since it is larger than the sum of its proper divisors (1823109).

56515387 is a wasteful number, since it uses less digits than its factorization.

56515387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1823108.

The product of its digits is 126000, while the sum is 40.

The square root of 56515387 is about 7517.6716475249. The cubic root of 56515387 is about 383.7563445424.

The spelling of 56515387 in words is "fifty-six million, five hundred fifteen thousand, three hundred eighty-seven".