56521145 has 16 divisors (see below), whose sum is σ = 70839360. Its totient is φ = 43237824.

The previous prime is 56521123. The next prime is 56521151. The reversal of 56521145 is 54112565.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 56521145 - 2⁸ = 56520889 is a prime.

It is a super-2 number, since 2×56521145² = 6389279664222050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13694 + ... + 17336.

It is an arithmetic number, because the mean of its divisors is an integer number (4427460).

Almost surely, 2^56521145 is an apocalyptic number.

It is an amenable number.

56521145 is a deficient number, since it is larger than the sum of its proper divisors (14318215).

56521145 is a wasteful number, since it uses less digits than its factorization.

56521145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3784.

The product of its digits is 6000, while the sum is 29.

The square root of 56521145 is about 7518.0546020896. The cubic root of 56521145 is about 383.7693769460.

The spelling of 56521145 in words is "fifty-six million, five hundred twenty-one thousand, one hundred forty-five".