1216168979 has 2 divisors, whose sum is σ = 1216168980. Its totient is φ = 1216168978.

The previous prime is 1216168951. The next prime is 1216168981. The reversal of 1216168979 is 9798616121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1216168979 - 2²⁴ = 1199391763 is a prime.

Together with 1216168981, 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 (1216168909) 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, 608084489 + 608084490.

It is an arithmetic number, because the mean of its divisors is an integer number (608084490).

Almost surely, 2^1216168979 is an apocalyptic number.

1216168979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216168979 is an equidigital number, since it uses as much as digits as its factorization.

1216168979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 50.

The square root of 1216168979 is about 34873.6143667386. The cubic root of 1216168979 is about 1067.4100984096.

The spelling of 1216168979 in words is "one billion, two hundred sixteen million, one hundred sixty-eight thousand, nine hundred seventy-nine".