56566109 has 4 divisors (see below), whose sum is σ = 56809116. Its totient is φ = 56323104.

The previous prime is 56566091. The next prime is 56566117. The reversal of 56566109 is 90166565.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90166565 = 5 ⋅18033313.

It can be written as a sum of positive squares in 2 ways, for example, as 25452025 + 31114084 = 5045^2 + 5578^2 .

It is a cyclic number.

It is not a de Polignac number, because 56566109 - 2⁸ = 56565853 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 (56563109) 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, 121154 + ... + 121619.

It is an arithmetic number, because the mean of its divisors is an integer number (14202279).

Almost surely, 2^56566109 is an apocalyptic number.

It is an amenable number.

56566109 is a deficient number, since it is larger than the sum of its proper divisors (243007).

56566109 is a wasteful number, since it uses less digits than its factorization.

56566109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243006.

The product of its (nonzero) digits is 48600, while the sum is 38.

The square root of 56566109 is about 7521.0444088571. The cubic root of 56566109 is about 383.8711160531.

The spelling of 56566109 in words is "fifty-six million, five hundred sixty-six thousand, one hundred nine".