655987 has 2 divisors, whose sum is σ = 655988. Its totient is φ = 655986.

The previous prime is 655961. The next prime is 656023. The reversal of 655987 is 789556.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 655987 - 2⁷ = 655859 is a prime.

It is not a weakly prime, because it can be changed into another prime (655927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327993 + 327994.

It is an arithmetic number, because the mean of its divisors is an integer number (327994).

2⁶⁵⁵⁹⁸⁷ is an apocalyptic number.

655987 is a deficient number, since it is larger than the sum of its proper divisors (1).

655987 is an equidigital number, since it uses as much as digits as its factorization.

655987 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 655987 is about 809.9302439099. The cubic root of 655987 is about 86.8890557455.

The spelling of 655987 in words is "six hundred fifty-five thousand, nine hundred eighty-seven".