868563979 has 2 divisors, whose sum is σ = 868563980. Its totient is φ = 868563978.

The previous prime is 868563911. The next prime is 868563989. The reversal of 868563979 is 979365868.

868563979 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 not a de Polignac number, because 868563979 - 2²¹ = 866466827 is a prime.

It is not a weakly prime, because it can be changed into another prime (868563989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434281989 + 434281990.

It is an arithmetic number, because the mean of its divisors is an integer number (434281990).

Almost surely, 2^868563979 is an apocalyptic number.

868563979 is a deficient number, since it is larger than the sum of its proper divisors (1).

868563979 is an equidigital number, since it uses as much as digits as its factorization.

868563979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19595520, while the sum is 61.

The square root of 868563979 is about 29471.4095183790. The cubic root of 868563979 is about 954.1147389711.

The spelling of 868563979 in words is "eight hundred sixty-eight million, five hundred sixty-three thousand, nine hundred seventy-nine".