117889979 has 2 divisors, whose sum is σ = 117889980. Its totient is φ = 117889978.

The previous prime is 117889957. The next prime is 117889991. The reversal of 117889979 is 979988711.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 117889979 - 2¹² = 117885883 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (117880979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58944989 + 58944990.

It is an arithmetic number, because the mean of its divisors is an integer number (58944990).

Almost surely, 2^117889979 is an apocalyptic number.

117889979 is a deficient number, since it is larger than the sum of its proper divisors (1).

117889979 is an equidigital number, since it uses as much as digits as its factorization.

117889979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2286144, while the sum is 59.

The square root of 117889979 is about 10857.7151832234. The cubic root of 117889979 is about 490.3343254971.

The spelling of 117889979 in words is "one hundred seventeen million, eight hundred eighty-nine thousand, nine hundred seventy-nine".