868559 has 2 divisors, whose sum is σ = 868560. Its totient is φ = 868558.

The previous prime is 868537. The next prime is 868561. The reversal of 868559 is 955868.

868559 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-868559 is a prime.

Together with 868561, 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 (868529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434279 + 434280.

It is an arithmetic number, because the mean of its divisors is an integer number (434280).

2⁸⁶⁸⁵⁵⁹ is an apocalyptic number.

868559 is a deficient number, since it is larger than the sum of its proper divisors (1).

868559 is an equidigital number, since it uses as much as digits as its factorization.

868559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86400, while the sum is 41.

The square root of 868559 is about 931.9651281030. The cubic root of 868559 is about 95.4112915829.

The spelling of 868559 in words is "eight hundred sixty-eight thousand, five hundred fifty-nine".