160991939 has 2 divisors, whose sum is σ = 160991940. Its totient is φ = 160991938.

The previous prime is 160991923. The next prime is 160991981. The reversal of 160991939 is 939199061.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 160991939 - 2⁴ = 160991923 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 160991893 and 160991902.

It is not a weakly prime, because it can be changed into another prime (160991639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80495969 + 80495970.

It is an arithmetic number, because the mean of its divisors is an integer number (80495970).

Almost surely, 2^160991939 is an apocalyptic number.

160991939 is a deficient number, since it is larger than the sum of its proper divisors (1).

160991939 is an equidigital number, since it uses as much as digits as its factorization.

160991939 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 160991939 is about 12688.2598885742. The cubic root of 160991939 is about 544.0031031307.

The spelling of 160991939 in words is "one hundred sixty million, nine hundred ninety-one thousand, nine hundred thirty-nine".