160991911 has 2 divisors, whose sum is σ = 160991912. Its totient is φ = 160991910.

The previous prime is 160991903. The next prime is 160991923. The reversal of 160991911 is 119199061.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 160991911 - 2³ = 160991903 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (160991981) 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, 80495955 + 80495956.

It is an arithmetic number, because the mean of its divisors is an integer number (80495956).

Almost surely, 2^160991911 is an apocalyptic number.

160991911 is a deficient number, since it is larger than the sum of its proper divisors (1).

160991911 is an equidigital number, since it uses as much as digits as its factorization.

160991911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4374, while the sum is 37.

The square root of 160991911 is about 12688.2587851919. The cubic root of 160991911 is about 544.0030715927.

The spelling of 160991911 in words is "one hundred sixty million, nine hundred ninety-one thousand, nine hundred eleven".