117912209 has 2 divisors, whose sum is σ = 117912210. Its totient is φ = 117912208.

The previous prime is 117912169. The next prime is 117912217. The reversal of 117912209 is 902219711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95491984 + 22420225 = 9772^2 + 4735^2 .

It is a cyclic number.

It is not a de Polignac number, because 117912209 - 2²⁰ = 116863633 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (117912259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58956104 + 58956105.

It is an arithmetic number, because the mean of its divisors is an integer number (58956105).

Almost surely, 2^117912209 is an apocalyptic number.

It is an amenable number.

117912209 is a deficient number, since it is larger than the sum of its proper divisors (1).

117912209 is an equidigital number, since it uses as much as digits as its factorization.

117912209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 32.

The square root of 117912209 is about 10858.7388310061. The cubic root of 117912209 is about 490.3651436296.

The spelling of 117912209 in words is "one hundred seventeen million, nine hundred twelve thousand, two hundred nine".