655559 has 2 divisors, whose sum is σ = 655560. Its totient is φ = 655558.

The previous prime is 655547. The next prime is 655561. The reversal of 655559 is 955556.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-655559 is a prime.

Together with 655561, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (655579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327779 + 327780.

It is an arithmetic number, because the mean of its divisors is an integer number (327780).

2⁶⁵⁵⁵⁵⁹ is an apocalyptic number.

655559 is a deficient number, since it is larger than the sum of its proper divisors (1).

655559 is an equidigital number, since it uses as much as digits as its factorization.

655559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33750, while the sum is 35.

The square root of 655559 is about 809.6659805130. The cubic root of 655559 is about 86.8701546562.

The spelling of 655559 in words is "six hundred fifty-five thousand, five hundred fifty-nine".