117915869 has 2 divisors, whose sum is σ = 117915870. Its totient is φ = 117915868.

The previous prime is 117915857. The next prime is 117915887. The reversal of 117915869 is 968519711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114811225 + 3104644 = 10715^2 + 1762^2 .

It is an emirp because it is prime and its reverse (968519711) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117915869 is a prime.

It is a super-2 number, since 2×117915869² = 27808304324050322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117915829) 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, 58957934 + 58957935.

It is an arithmetic number, because the mean of its divisors is an integer number (58957935).

Almost surely, 2^117915869 is an apocalyptic number.

It is an amenable number.

117915869 is a deficient number, since it is larger than the sum of its proper divisors (1).

117915869 is an equidigital number, since it uses as much as digits as its factorization.

117915869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 47.

The square root of 117915869 is about 10858.9073575567. The cubic root of 117915869 is about 490.3702172288.

The spelling of 117915869 in words is "one hundred seventeen million, nine hundred fifteen thousand, eight hundred sixty-nine".