56659209 has 4 divisors (see below), whose sum is σ = 75545616. Its totient is φ = 37772804.

The previous prime is 56659193. The next prime is 56659219. The reversal of 56659209 is 90295665.

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 56659209 - 2⁴ = 56659193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56659219) 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, 9443199 + ... + 9443204.

It is an arithmetic number, because the mean of its divisors is an integer number (18886404).

Almost surely, 2^56659209 is an apocalyptic number.

It is an amenable number.

56659209 is a deficient number, since it is larger than the sum of its proper divisors (18886407).

56659209 is a wasteful number, since it uses less digits than its factorization.

56659209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18886406.

The product of its (nonzero) digits is 145800, while the sum is 42.

The square root of 56659209 is about 7527.2311642463. The cubic root of 56659209 is about 384.0816002260.

The spelling of 56659209 in words is "fifty-six million, six hundred fifty-nine thousand, two hundred nine".