556891 has 2 divisors, whose sum is σ = 556892. Its totient is φ = 556890.

The previous prime is 556883. The next prime is 556931. The reversal of 556891 is 198655.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 556891 - 2³ = 556883 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (556811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278445 + 278446.

It is an arithmetic number, because the mean of its divisors is an integer number (278446).

2⁵⁵⁶⁸⁹¹ is an apocalyptic number.

556891 is a deficient number, since it is larger than the sum of its proper divisors (1).

556891 is an equidigital number, since it uses as much as digits as its factorization.

556891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 34.

The square root of 556891 is about 746.2512981563. The cubic root of 556891 is about 82.2728862197.

The spelling of 556891 in words is "five hundred fifty-six thousand, eight hundred ninety-one".