160939991 has 2 divisors, whose sum is σ = 160939992. Its totient is φ = 160939990.

The previous prime is 160939967. The next prime is 160940027. The reversal of 160939991 is 199939061.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-160939991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (160939921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80469995 + 80469996.

It is an arithmetic number, because the mean of its divisors is an integer number (80469996).

Almost surely, 2^160939991 is an apocalyptic number.

160939991 is a deficient number, since it is larger than the sum of its proper divisors (1).

160939991 is an equidigital number, since it uses as much as digits as its factorization.

160939991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 118098, while the sum is 47.

The square root of 160939991 is about 12686.2126341947. The cubic root of 160939991 is about 543.9445848523.

The spelling of 160939991 in words is "one hundred sixty million, nine hundred thirty-nine thousand, nine hundred ninety-one".