320161691 has 2 divisors, whose sum is σ = 320161692. Its totient is φ = 320161690.

The previous prime is 320161651. The next prime is 320161693. The reversal of 320161691 is 196161023.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 320161691 - 2²² = 315967387 is a prime.

Together with 320161693, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (320161693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160080845 + 160080846.

It is an arithmetic number, because the mean of its divisors is an integer number (160080846).

Almost surely, 2^320161691 is an apocalyptic number.

320161691 is a deficient number, since it is larger than the sum of its proper divisors (1).

320161691 is an equidigital number, since it uses as much as digits as its factorization.

320161691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 320161691 is about 17893.0626500887. The cubic root of 320161691 is about 684.1055624897.

The spelling of 320161691 in words is "three hundred twenty million, one hundred sixty-one thousand, six hundred ninety-one".