168238979 has 2 divisors, whose sum is σ = 168238980. Its totient is φ = 168238978.

The previous prime is 168238969. The next prime is 168238981. The reversal of 168238979 is 979832861.

168238979 is nontrivially palindromic in base 15.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 168238979 - 2¹² = 168234883 is a prime.

It is a Sophie Germain prime.

Together with 168238981, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 168238979.

It is not a weakly prime, because it can be changed into another prime (168238969) 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, 84119489 + 84119490.

It is an arithmetic number, because the mean of its divisors is an integer number (84119490).

Almost surely, 2^168238979 is an apocalyptic number.

168238979 is a deficient number, since it is larger than the sum of its proper divisors (1).

168238979 is an equidigital number, since it uses as much as digits as its factorization.

168238979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1306368, while the sum is 53.

The square root of 168238979 is about 12970.6969357857. The cubic root of 168238979 is about 552.0463481965.

The spelling of 168238979 in words is "one hundred sixty-eight million, two hundred thirty-eight thousand, nine hundred seventy-nine".