566609 has 4 divisors (see below), whose sum is σ = 568116. Its totient is φ = 565104.

The previous prime is 566567. The next prime is 566617. The reversal of 566609 is 906665.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 313600 + 253009 = 560^2 + 503^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-566609 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (566639) 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, 347 + ... + 1119.

It is an arithmetic number, because the mean of its divisors is an integer number (142029).

2⁵⁶⁶⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

566609 is a deficient number, since it is larger than the sum of its proper divisors (1507).

566609 is an equidigital number, since it uses as much as digits as its factorization.

566609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1506.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 566609 is about 752.7343488908. The cubic root of 566609 is about 82.7486955311.

The spelling of 566609 in words is "five hundred sixty-six thousand, six hundred nine".