556091 has 4 divisors (see below), whose sum is σ = 558000. Its totient is φ = 554184.

The previous prime is 556069. The next prime is 556093. The reversal of 556091 is 190655.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 556091 - 2⁶ = 556027 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 556091.

It is not an unprimeable number, because it can be changed into a prime (556093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 416 + ... + 1133.

It is an arithmetic number, because the mean of its divisors is an integer number (139500).

2⁵⁵⁶⁰⁹¹ is an apocalyptic number.

556091 is a deficient number, since it is larger than the sum of its proper divisors (1909).

556091 is a wasteful number, since it uses less digits than its factorization.

556091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1908.

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

The square root of 556091 is about 745.7150930483. The cubic root of 556091 is about 82.2334710552.

The spelling of 556091 in words is "five hundred fifty-six thousand, ninety-one".