56815513 has 8 divisors (see below), whose sum is σ = 61557408. Its totient is φ = 52229184.

The previous prime is 56815483. The next prime is 56815537. The reversal of 56815513 is 31551865.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 56815513 - 2²¹ = 54718361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56815573) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38131 + ... + 39592.

It is an arithmetic number, because the mean of its divisors is an integer number (7694676).

Almost surely, 2^56815513 is an apocalyptic number.

It is an amenable number.

56815513 is a deficient number, since it is larger than the sum of its proper divisors (4741895).

56815513 is a wasteful number, since it uses less digits than its factorization.

56815513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77783.

The product of its digits is 18000, while the sum is 34.

The square root of 56815513 is about 7537.6065829944. The cubic root of 56815513 is about 384.4344606098.

The spelling of 56815513 in words is "fifty-six million, eight hundred fifteen thousand, five hundred thirteen".