855365989 has 2 divisors, whose sum is σ = 855365990. Its totient is φ = 855365988.

The previous prime is 855365969. The next prime is 855366041. The reversal of 855365989 is 989563558.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 588305025 + 267060964 = 24255^2 + 16342^2 .

It is a cyclic number.

It is not a de Polignac number, because 855365989 - 2⁵ = 855365957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (855365969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427682994 + 427682995.

It is an arithmetic number, because the mean of its divisors is an integer number (427682995).

Almost surely, 2^855365989 is an apocalyptic number.

It is an amenable number.

855365989 is a deficient number, since it is larger than the sum of its proper divisors (1).

855365989 is an equidigital number, since it uses as much as digits as its factorization.

855365989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664000, while the sum is 58.

The square root of 855365989 is about 29246.6406446963. The cubic root of 855365989 is about 949.2574026869.

The spelling of 855365989 in words is "eight hundred fifty-five million, three hundred sixty-five thousand, nine hundred eighty-nine".