56566409 has 4 divisors (see below), whose sum is σ = 57248016. Its totient is φ = 55884804.

The previous prime is 56566399. The next prime is 56566441. The reversal of 56566409 is 90466565.

56566409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a de Polignac number, because none of the positive numbers 2^k-56566409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56566469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 340679 + ... + 340844.

It is an arithmetic number, because the mean of its divisors is an integer number (14312004).

Almost surely, 2^56566409 is an apocalyptic number.

It is an amenable number.

56566409 is a deficient number, since it is larger than the sum of its proper divisors (681607).

56566409 is an equidigital number, since it uses as much as digits as its factorization.

56566409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681606.

The product of its (nonzero) digits is 194400, while the sum is 41.

The square root of 56566409 is about 7521.0643528692. The cubic root of 56566409 is about 383.8717946758.

The spelling of 56566409 in words is "fifty-six million, five hundred sixty-six thousand, four hundred nine".