556109 has 4 divisors (see below), whose sum is σ = 574080. Its totient is φ = 538140.

The previous prime is 556103. The next prime is 556123. The reversal of 556109 is 901655.

556109 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 a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 901655 = 5 ⋅180331.

It is a cyclic number.

It is not a de Polignac number, because 556109 - 2⁴ = 556093 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 (556103) 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, 8939 + ... + 9000.

It is an arithmetic number, because the mean of its divisors is an integer number (143520).

2⁵⁵⁶¹⁰⁹ is an apocalyptic number.

It is an amenable number.

556109 is a deficient number, since it is larger than the sum of its proper divisors (17971).

556109 is a wasteful number, since it uses less digits than its factorization.

556109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17970.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 556109 is about 745.7271619031. The cubic root of 556109 is about 82.2343583120.

The spelling of 556109 in words is "five hundred fifty-six thousand, one hundred nine".