86897917 has 2 divisors, whose sum is σ = 86897918. Its totient is φ = 86897916.

The previous prime is 86897879. The next prime is 86897939. The reversal of 86897917 is 71979868.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84254041 + 2643876 = 9179^2 + 1626^2 .

It is a cyclic number.

It is not a de Polignac number, because 86897917 - 2²³ = 78509309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86897017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43448958 + 43448959.

It is an arithmetic number, because the mean of its divisors is an integer number (43448959).

Almost surely, 2^86897917 is an apocalyptic number.

It is an amenable number.

86897917 is a deficient number, since it is larger than the sum of its proper divisors (1).

86897917 is an equidigital number, since it uses as much as digits as its factorization.

86897917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 55.

The square root of 86897917 is about 9321.9052237190. The cubic root of 86897917 is about 442.9313860513.

The spelling of 86897917 in words is "eighty-six million, eight hundred ninety-seven thousand, nine hundred seventeen".