86918917 has 2 divisors, whose sum is σ = 86918918. Its totient is φ = 86918916.

The previous prime is 86918911. The next prime is 86918921. The reversal of 86918917 is 71981968.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76895361 + 10023556 = 8769^2 + 3166^2 .

It is a cyclic number.

It is not a de Polignac number, because 86918917 - 2⁷ = 86918789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86918911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43459458 + 43459459.

It is an arithmetic number, because the mean of its divisors is an integer number (43459459).

Almost surely, 2^86918917 is an apocalyptic number.

It is an amenable number.

86918917 is a deficient number, since it is larger than the sum of its proper divisors (1).

86918917 is an equidigital number, since it uses as much as digits as its factorization.

86918917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 49.

The square root of 86918917 is about 9323.0315348603. The cubic root of 86918917 is about 442.9670632008.

The spelling of 86918917 in words is "eighty-six million, nine hundred eighteen thousand, nine hundred seventeen".