168169979 has 2 divisors, whose sum is σ = 168169980. Its totient is φ = 168169978.

The previous prime is 168169973. The next prime is 168169993. The reversal of 168169979 is 979961861.

It is a weak prime.

It is an emirp because it is prime and its reverse (979961861) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168169979 is a prime.

It is a super-2 number, since 2×168169979² = 56562283673720882, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (168169973) 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, 84084989 + 84084990.

It is an arithmetic number, because the mean of its divisors is an integer number (84084990).

Almost surely, 2^168169979 is an apocalyptic number.

168169979 is a deficient number, since it is larger than the sum of its proper divisors (1).

168169979 is an equidigital number, since it uses as much as digits as its factorization.

168169979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1469664, while the sum is 56.

The square root of 168169979 is about 12968.0368213543. The cubic root of 168169979 is about 551.9708674589.

The spelling of 168169979 in words is "one hundred sixty-eight million, one hundred sixty-nine thousand, nine hundred seventy-nine".