868856609 has 2 divisors, whose sum is σ = 868856610. Its totient is φ = 868856608.

The previous prime is 868856563. The next prime is 868856627. The reversal of 868856609 is 906658868.

868856609 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 can be written as a sum of positive squares in only one way, i.e., 495285025 + 373571584 = 22255^2 + 19328^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-868856609 is a prime.

It is not a weakly prime, because it can be changed into another prime (868856629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434428304 + 434428305.

It is an arithmetic number, because the mean of its divisors is an integer number (434428305).

Almost surely, 2^868856609 is an apocalyptic number.

It is an amenable number.

868856609 is a deficient number, since it is larger than the sum of its proper divisors (1).

868856609 is an equidigital number, since it uses as much as digits as its factorization.

868856609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4976640, while the sum is 56.

The square root of 868856609 is about 29476.3737423720. The cubic root of 868856609 is about 954.2218779779.

The spelling of 868856609 in words is "eight hundred sixty-eight million, eight hundred fifty-six thousand, six hundred nine".