556609 has 2 divisors, whose sum is σ = 556610. Its totient is φ = 556608.

The previous prime is 556607. The next prime is 556613. The reversal of 556609 is 906655.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 540225 + 16384 = 735^2 + 128^2 .

It is a cyclic number.

It is not a de Polignac number, because 556609 - 2¹ = 556607 is a prime.

Together with 556607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (556601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278304 + 278305.

It is an arithmetic number, because the mean of its divisors is an integer number (278305).

2⁵⁵⁶⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

556609 is a deficient number, since it is larger than the sum of its proper divisors (1).

556609 is an equidigital number, since it uses as much as digits as its factorization.

556609 is an odious number, because the sum of its binary digits is odd.

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

The square root of 556609 is about 746.0623298358. The cubic root of 556609 is about 82.2589966847.

The spelling of 556609 in words is "five hundred fifty-six thousand, six hundred nine".