161365979 has 2 divisors, whose sum is σ = 161365980. Its totient is φ = 161365978.

The previous prime is 161365961. The next prime is 161366021. The reversal of 161365979 is 979563161.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (979563161) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161365979 is a prime.

It is not a weakly prime, because it can be changed into another prime (161361979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80682989 + 80682990.

It is an arithmetic number, because the mean of its divisors is an integer number (80682990).

Almost surely, 2^161365979 is an apocalyptic number.

161365979 is a deficient number, since it is larger than the sum of its proper divisors (1).

161365979 is an equidigital number, since it uses as much as digits as its factorization.

161365979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 306180, while the sum is 47.

The square root of 161365979 is about 12702.9909470172. The cubic root of 161365979 is about 544.4240797773.

The spelling of 161365979 in words is "one hundred sixty-one million, three hundred sixty-five thousand, nine hundred seventy-nine".