320303993 has 2 divisors, whose sum is σ = 320303994. Its totient is φ = 320303992.

The previous prime is 320303981. The next prime is 320304001. The reversal of 320303993 is 399303023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214563904 + 105740089 = 14648^2 + 10283^2 .

It is a cyclic number.

It is not a de Polignac number, because 320303993 - 2¹² = 320299897 is a prime.

It is not a weakly prime, because it can be changed into another prime (320303923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160151996 + 160151997.

It is an arithmetic number, because the mean of its divisors is an integer number (160151997).

Almost surely, 2^320303993 is an apocalyptic number.

It is an amenable number.

320303993 is a deficient number, since it is larger than the sum of its proper divisors (1).

320303993 is an equidigital number, since it uses as much as digits as its factorization.

320303993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13122, while the sum is 32.

The square root of 320303993 is about 17897.0386656564. The cubic root of 320303993 is about 684.2069020868.

The spelling of 320303993 in words is "three hundred twenty million, three hundred three thousand, nine hundred ninety-three".