5656809 has 4 divisors (see below), whose sum is σ = 7542416. Its totient is φ = 3771204.

The previous prime is 5656799. The next prime is 5656817. The reversal of 5656809 is 9086565.

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 not a de Polignac number, because 5656809 - 2⁹ = 5656297 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5656829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 942799 + ... + 942804.

It is an arithmetic number, because the mean of its divisors is an integer number (1885604).

Almost surely, 2^5656809 is an apocalyptic number.

It is an amenable number.

5656809 is a deficient number, since it is larger than the sum of its proper divisors (1885607).

5656809 is a wasteful number, since it uses less digits than its factorization.

5656809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1885606.

The product of its (nonzero) digits is 64800, while the sum is 39.

The square root of 5656809 is about 2378.4047174524. The cubic root of 5656809 is about 178.1792685369.

It can be divided in two parts, 56 and 56809, that added together give a palindrome (56865).

The spelling of 5656809 in words is "five million, six hundred fifty-six thousand, eight hundred nine".