56516015 has 4 divisors (see below), whose sum is σ = 67819224. Its totient is φ = 45212808.

The previous prime is 56516011. The next prime is 56516017. The reversal of 56516015 is 51061565.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51061565 = 5 ⋅10212313.

It is a cyclic number.

It is not a de Polignac number, because 56516015 - 2² = 56516011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56516011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5651597 + ... + 5651606.

It is an arithmetic number, because the mean of its divisors is an integer number (16954806).

Almost surely, 2^56516015 is an apocalyptic number.

56516015 is a deficient number, since it is larger than the sum of its proper divisors (11303209).

56516015 is a wasteful number, since it uses less digits than its factorization.

56516015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11303208.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 56516015 is about 7517.7134156604. The cubic root of 56516015 is about 383.7577659730.

The spelling of 56516015 in words is "fifty-six million, five hundred sixteen thousand, fifteen".