56165521 has 4 divisors (see below), whose sum is σ = 57977344. Its totient is φ = 54353700.

The previous prime is 56165513. The next prime is 56165533. The reversal of 56165521 is 12556165.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 56165521 - 2³ = 56165513 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 1811791 = 56165521 / (5 + 6 + 1 + 6 + 5 + 5 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56165321) 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, 905865 + ... + 905926.

It is an arithmetic number, because the mean of its divisors is an integer number (14494336).

Almost surely, 2^56165521 is an apocalyptic number.

It is an amenable number.

56165521 is a deficient number, since it is larger than the sum of its proper divisors (1811823).

56165521 is a wasteful number, since it uses less digits than its factorization.

56165521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1811822.

The product of its digits is 9000, while the sum is 31.

The square root of 56165521 is about 7494.3659504991. The cubic root of 56165521 is about 382.9628065967.

The spelling of 56165521 in words is "fifty-six million, one hundred sixty-five thousand, five hundred twenty-one".