556987 has 2 divisors, whose sum is σ = 556988. Its totient is φ = 556986.

The previous prime is 556981. The next prime is 556999. The reversal of 556987 is 789655.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 556987 - 2⁷ = 556859 is a prime.

It is not a weakly prime, because it can be changed into another prime (556981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278493 + 278494.

It is an arithmetic number, because the mean of its divisors is an integer number (278494).

2⁵⁵⁶⁹⁸⁷ is an apocalyptic number.

556987 is a deficient number, since it is larger than the sum of its proper divisors (1).

556987 is an equidigital number, since it uses as much as digits as its factorization.

556987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 40.

The square root of 556987 is about 746.3156168807. The cubic root of 556987 is about 82.2776135023.

The spelling of 556987 in words is "five hundred fifty-six thousand, nine hundred eighty-seven".