160991923 has 2 divisors, whose sum is σ = 160991924. Its totient is φ = 160991922.

The previous prime is 160991911. The next prime is 160991939. The reversal of 160991923 is 329199061.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 160991923 - 2¹³ = 160983731 is a prime.

It is not a weakly prime, because it can be changed into another prime (160991903) 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, 80495961 + 80495962.

It is an arithmetic number, because the mean of its divisors is an integer number (80495962).

Almost surely, 2^160991923 is an apocalyptic number.

160991923 is a deficient number, since it is larger than the sum of its proper divisors (1).

160991923 is an equidigital number, since it uses as much as digits as its factorization.

160991923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26244, while the sum is 40.

The square root of 160991923 is about 12688.2592580700. The cubic root of 160991923 is about 544.0030851090.

The spelling of 160991923 in words is "one hundred sixty million, nine hundred ninety-one thousand, nine hundred twenty-three".