117818509 has 2 divisors, whose sum is σ = 117818510. Its totient is φ = 117818508.

The previous prime is 117818501. The next prime is 117818513. The reversal of 117818509 is 905818711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63840100 + 53978409 = 7990^2 + 7347^2 .

It is a cyclic number.

It is not a de Polignac number, because 117818509 - 2³ = 117818501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117818501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58909254 + 58909255.

It is an arithmetic number, because the mean of its divisors is an integer number (58909255).

Almost surely, 2^117818509 is an apocalyptic number.

It is an amenable number.

117818509 is a deficient number, since it is larger than the sum of its proper divisors (1).

117818509 is an equidigital number, since it uses as much as digits as its factorization.

117818509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 40.

The square root of 117818509 is about 10854.4234761686. The cubic root of 117818509 is about 490.2352181805.

The spelling of 117818509 in words is "one hundred seventeen million, eight hundred eighteen thousand, five hundred nine".