556309 has 4 divisors (see below), whose sum is σ = 599116. Its totient is φ = 513504.

The previous prime is 556289. The next prime is 556313. The reversal of 556309 is 903655.

It is a happy number.

556309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 903655 = 5 ⋅180731.

It can be written as a sum of positive squares in 2 ways, for example, as 178084 + 378225 = 422^2 + 615^2 .

It is a cyclic number.

It is not a de Polignac number, because 556309 - 2⁷ = 556181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556399) 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, 21384 + ... + 21409.

It is an arithmetic number, because the mean of its divisors is an integer number (149779).

2⁵⁵⁶³⁰⁹ is an apocalyptic number.

It is an amenable number.

556309 is a deficient number, since it is larger than the sum of its proper divisors (42807).

556309 is a wasteful number, since it uses less digits than its factorization.

556309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42806.

The product of its (nonzero) digits is 4050, while the sum is 28.

The square root of 556309 is about 745.8612471499. The cubic root of 556309 is about 82.2442154325.

The spelling of 556309 in words is "five hundred fifty-six thousand, three hundred nine".