556687 has 2 divisors, whose sum is σ = 556688. Its totient is φ = 556686.

The previous prime is 556679. The next prime is 556691. The reversal of 556687 is 786655.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 556687 - 2³ = 556679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (556607) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278343 + 278344.

It is an arithmetic number, because the mean of its divisors is an integer number (278344).

2⁵⁵⁶⁶⁸⁷ is an apocalyptic number.

556687 is a deficient number, since it is larger than the sum of its proper divisors (1).

556687 is an equidigital number, since it uses as much as digits as its factorization.

556687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 37.

The square root of 556687 is about 746.1146024573. The cubic root of 556687 is about 82.2628389402.

The spelling of 556687 in words is "five hundred fifty-six thousand, six hundred eighty-seven".