168311979 has 16 divisors (see below), whose sum is σ = 272019840. Its totient is φ = 102007080.

The previous prime is 168311959. The next prime is 168311981. The reversal of 168311979 is 979113861.

It is not a de Polignac number, because 168311979 - 2¹⁷ = 168180907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (168311909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 283057 + ... + 283650.

It is an arithmetic number, because the mean of its divisors is an integer number (17001240).

Almost surely, 2^168311979 is an apocalyptic number.

168311979 is a deficient number, since it is larger than the sum of its proper divisors (103707861).

168311979 is a wasteful number, since it uses less digits than its factorization.

168311979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566727 (or 566721 counting only the distinct ones).

The product of its digits is 81648, while the sum is 45.

The square root of 168311979 is about 12973.5106659686. The cubic root of 168311979 is about 552.1261821651.

The spelling of 168311979 in words is "one hundred sixty-eight million, three hundred eleven thousand, nine hundred seventy-nine".