56215515 has 32 divisors (see below), whose sum is σ = 96344640. Its totient is φ = 27889664.

The previous prime is 56215513. The next prime is 56215541. The reversal of 56215515 is 51551265.

It is a cyclic number.

It is not a de Polignac number, because 56215515 - 2¹ = 56215513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56215513) 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 31 ways as a sum of consecutive naturals, for example, 21457 + ... + 23933.

It is an arithmetic number, because the mean of its divisors is an integer number (3010770).

Almost surely, 2^56215515 is an apocalyptic number.

56215515 is a deficient number, since it is larger than the sum of its proper divisors (40129125).

56215515 is a wasteful number, since it uses less digits than its factorization.

56215515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2591.

The product of its digits is 7500, while the sum is 30.

The square root of 56215515 is about 7497.7006475319. The cubic root of 56215515 is about 383.0764003954.

The spelling of 56215515 in words is "fifty-six million, two hundred fifteen thousand, five hundred fifteen".