989895917 has 2 divisors, whose sum is σ = 989895918. Its totient is φ = 989895916.

The previous prime is 989895899. The next prime is 989895971. The reversal of 989895917 is 719598989.

989895917 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with next prime (989895971) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 632723716 + 357172201 = 25154^2 + 18899^2 .

It is a cyclic number.

It is not a de Polignac number, because 989895917 - 2⁶ = 989895853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989805917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494947958 + 494947959.

It is an arithmetic number, because the mean of its divisors is an integer number (494947959).

Almost surely, 2^989895917 is an apocalyptic number.

It is an amenable number.

989895917 is a deficient number, since it is larger than the sum of its proper divisors (1).

989895917 is an equidigital number, since it uses as much as digits as its factorization.

989895917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14696640, while the sum is 65.

The square root of 989895917 is about 31462.6114141849. The cubic root of 989895917 is about 996.6205646149.

The spelling of 989895917 in words is "nine hundred eighty-nine million, eight hundred ninety-five thousand, nine hundred seventeen".