117185917 has 2 divisors, whose sum is σ = 117185918. Its totient is φ = 117185916.

The previous prime is 117185869. The next prime is 117185923. The reversal of 117185917 is 719581711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115906756 + 1279161 = 10766^2 + 1131^2 .

It is a cyclic number.

It is not a de Polignac number, because 117185917 - 2²³ = 108797309 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 117185917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117185927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58592958 + 58592959.

It is an arithmetic number, because the mean of its divisors is an integer number (58592959).

Almost surely, 2^117185917 is an apocalyptic number.

It is an amenable number.

117185917 is a deficient number, since it is larger than the sum of its proper divisors (1).

117185917 is an equidigital number, since it uses as much as digits as its factorization.

117185917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17640, while the sum is 40.

The square root of 117185917 is about 10825.2444314205. The cubic root of 117185917 is about 489.3562516747.

The spelling of 117185917 in words is "one hundred seventeen million, one hundred eighty-five thousand, nine hundred seventeen".