56545809 has 4 divisors (see below), whose sum is σ = 75394416. Its totient is φ = 37697204.

The previous prime is 56545807. The next prime is 56545813. The reversal of 56545809 is 90854565.

56545809 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 not a de Polignac number, because 56545809 - 2¹ = 56545807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56545807) 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, 9424299 + ... + 9424304.

It is an arithmetic number, because the mean of its divisors is an integer number (18848604).

Almost surely, 2^56545809 is an apocalyptic number.

It is an amenable number.

56545809 is a deficient number, since it is larger than the sum of its proper divisors (18848607).

56545809 is a wasteful number, since it uses less digits than its factorization.

56545809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18848606.

The product of its (nonzero) digits is 216000, while the sum is 42.

The square root of 56545809 is about 7519.6947411447. The cubic root of 56545809 is about 383.8251903439.

The spelling of 56545809 in words is "fifty-six million, five hundred forty-five thousand, eight hundred nine".