565609 has 4 divisors (see below), whose sum is σ = 617040. Its totient is φ = 514180.

The previous prime is 565603. The next prime is 565613. The reversal of 565609 is 906565.

It is a happy number.

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 565609 - 2¹¹ = 563561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (565603) 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, 25699 + ... + 25720.

It is an arithmetic number, because the mean of its divisors is an integer number (154260).

2⁵⁶⁵⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

565609 is a deficient number, since it is larger than the sum of its proper divisors (51431).

565609 is a wasteful number, since it uses less digits than its factorization.

565609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51430.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 565609 is about 752.0698105894. The cubic root of 565609 is about 82.6999862071.

It can be divided in two parts, 56 and 5609, that added together give a palindrome (5665).

The spelling of 565609 in words is "five hundred sixty-five thousand, six hundred nine".