868840589 has 2 divisors, whose sum is σ = 868840590. Its totient is φ = 868840588.

The previous prime is 868840579. The next prime is 868840591. The reversal of 868840589 is 985048868.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 542424100 + 326416489 = 23290^2 + 18067^2 .

It is a cyclic number.

It is not a de Polignac number, because 868840589 - 2⁸ = 868840333 is a prime.

Together with 868840591, 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 (868840529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434420294 + 434420295.

It is an arithmetic number, because the mean of its divisors is an integer number (434420295).

Almost surely, 2^868840589 is an apocalyptic number.

It is an amenable number.

868840589 is a deficient number, since it is larger than the sum of its proper divisors (1).

868840589 is an equidigital number, since it uses as much as digits as its factorization.

868840589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4423680, while the sum is 56.

The square root of 868840589 is about 29476.1019980594. The cubic root of 868840589 is about 954.2160132862.

The spelling of 868840589 in words is "eight hundred sixty-eight million, eight hundred forty thousand, five hundred eighty-nine".