117217979 has 2 divisors, whose sum is σ = 117217980. Its totient is φ = 117217978.

The previous prime is 117217949. The next prime is 117217981. The reversal of 117217979 is 979712711.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 117217979 - 2¹⁶ = 117152443 is a prime.

Together with 117217981, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (117217949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58608989 + 58608990.

It is an arithmetic number, because the mean of its divisors is an integer number (58608990).

Almost surely, 2^117217979 is an apocalyptic number.

117217979 is a deficient number, since it is larger than the sum of its proper divisors (1).

117217979 is an equidigital number, since it uses as much as digits as its factorization.

117217979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55566, while the sum is 44.

The square root of 117217979 is about 10826.7252204903. The cubic root of 117217979 is about 489.4008768022.

The spelling of 117217979 in words is "one hundred seventeen million, two hundred seventeen thousand, nine hundred seventy-nine".