321393139 has 2 divisors, whose sum is σ = 321393140. Its totient is φ = 321393138.

The previous prime is 321393067. The next prime is 321393179. The reversal of 321393139 is 931393123.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321393139 is a prime.

It is not a weakly prime, because it can be changed into another prime (321393179) 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, 160696569 + 160696570.

It is an arithmetic number, because the mean of its divisors is an integer number (160696570).

Almost surely, 2^321393139 is an apocalyptic number.

321393139 is a deficient number, since it is larger than the sum of its proper divisors (1).

321393139 is an equidigital number, since it uses as much as digits as its factorization.

321393139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13122, while the sum is 34.

The square root of 321393139 is about 17927.4409495611. The cubic root of 321393139 is about 684.9815392755.

The spelling of 321393139 in words is "three hundred twenty-one million, three hundred ninety-three thousand, one hundred thirty-nine".