556931 has 2 divisors, whose sum is σ = 556932. Its totient is φ = 556930.

The previous prime is 556891. The next prime is 556939. The reversal of 556931 is 139655.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 556931 - 2⁶ = 556867 is a prime.

It is a super-2 number, since 2×556931² = 620344277522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 556894 and 556903.

It is not a weakly prime, because it can be changed into another prime (556939) 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 as a sum of consecutive naturals, namely, 278465 + 278466.

It is an arithmetic number, because the mean of its divisors is an integer number (278466).

2⁵⁵⁶⁹³¹ is an apocalyptic number.

556931 is a deficient number, since it is larger than the sum of its proper divisors (1).

556931 is an equidigital number, since it uses as much as digits as its factorization.

556931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4050, while the sum is 29.

The square root of 556931 is about 746.2780982985. The cubic root of 556931 is about 82.2748559868.

The spelling of 556931 in words is "five hundred fifty-six thousand, nine hundred thirty-one".