868905889 has 2 divisors, whose sum is σ = 868905890. Its totient is φ = 868905888.

The previous prime is 868905871. The next prime is 868905931. The reversal of 868905889 is 988509868.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 860542225 + 8363664 = 29335^2 + 2892^2 .

It is a cyclic number.

It is not a de Polignac number, because 868905889 - 2⁷ = 868905761 is a prime.

It is not a weakly prime, because it can be changed into another prime (868005889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434452944 + 434452945.

It is an arithmetic number, because the mean of its divisors is an integer number (434452945).

Almost surely, 2^868905889 is an apocalyptic number.

It is an amenable number.

868905889 is a deficient number, since it is larger than the sum of its proper divisors (1).

868905889 is an equidigital number, since it uses as much as digits as its factorization.

868905889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9953280, while the sum is 61.

The square root of 868905889 is about 29477.2096542397. The cubic root of 868905889 is about 954.2399182256.

The spelling of 868905889 in words is "eight hundred sixty-eight million, nine hundred five thousand, eight hundred eighty-nine".