320113991 has 2 divisors, whose sum is σ = 320113992. Its totient is φ = 320113990.

The previous prime is 320113951. The next prime is 320114017. The reversal of 320113991 is 199311023.

It is a strong prime.

It is an emirp because it is prime and its reverse (199311023) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320113991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320113901) 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, 160056995 + 160056996.

It is an arithmetic number, because the mean of its divisors is an integer number (160056996).

Almost surely, 2^320113991 is an apocalyptic number.

320113991 is a deficient number, since it is larger than the sum of its proper divisors (1).

320113991 is an equidigital number, since it uses as much as digits as its factorization.

320113991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 320113991 is about 17891.7296816155. The cubic root of 320113991 is about 684.0715864738.

The spelling of 320113991 in words is "three hundred twenty million, one hundred thirteen thousand, nine hundred ninety-one".