117912217 has 2 divisors, whose sum is σ = 117912218. Its totient is φ = 117912216.

The previous prime is 117912209. The next prime is 117912241. The reversal of 117912217 is 712219711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92621376 + 25290841 = 9624^2 + 5029^2 .

It is a cyclic number.

It is not a de Polignac number, because 117912217 - 2³ = 117912209 is a prime.

It is not a weakly prime, because it can be changed into another prime (117912317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58956108 + 58956109.

It is an arithmetic number, because the mean of its divisors is an integer number (58956109).

Almost surely, 2^117912217 is an apocalyptic number.

It is an amenable number.

117912217 is a deficient number, since it is larger than the sum of its proper divisors (1).

117912217 is an equidigital number, since it uses as much as digits as its factorization.

117912217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1764, while the sum is 31.

The square root of 117912217 is about 10858.7391993730. The cubic root of 117912217 is about 490.3651547196.

The spelling of 117912217 in words is "one hundred seventeen million, nine hundred twelve thousand, two hundred seventeen".