117989 has 2 divisors, whose sum is σ = 117990. Its totient is φ = 117988.

The previous prime is 117979. The next prime is 117991. The reversal of 117989 is 989711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 93025 + 24964 = 305^2 + 158^2 .

It is a cyclic number.

It is not a de Polignac number, because 117989 - 2⁴ = 117973 is a prime.

It is a Sophie Germain prime.

Together with 117991, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58994 + 58995.

It is an arithmetic number, because the mean of its divisors is an integer number (58995).

2¹¹⁷⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

117989 is a deficient number, since it is larger than the sum of its proper divisors (1).

117989 is an equidigital number, since it uses as much as digits as its factorization.

117989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 35.

The square root of 117989 is about 343.4952692542. The cubic root of 117989 is about 49.0471571563.

It can be divided in two parts, 11 and 7989, that added together give a cube (8000 = 20³).

The spelling of 117989 in words is "one hundred seventeen thousand, nine hundred eighty-nine".