160979991 has 4 divisors (see below), whose sum is σ = 214639992. Its totient is φ = 107319992.

The previous prime is 160979977. The next prime is 160980031. The reversal of 160979991 is 199979061.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-160979991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (160979971) 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 in 3 ways as a sum of consecutive naturals, for example, 26829996 + ... + 26830001.

It is an arithmetic number, because the mean of its divisors is an integer number (53659998).

Almost surely, 2^160979991 is an apocalyptic number.

160979991 is a deficient number, since it is larger than the sum of its proper divisors (53660001).

160979991 is an equidigital number, since it uses as much as digits as its factorization.

160979991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53660000.

The product of its (nonzero) digits is 275562, while the sum is 51.

The square root of 160979991 is about 12687.7890508946. The cubic root of 160979991 is about 543.9896450866.

The spelling of 160979991 in words is "one hundred sixty million, nine hundred seventy-nine thousand, nine hundred ninety-one".