321020317 has 2 divisors, whose sum is σ = 321020318. Its totient is φ = 321020316.

The previous prime is 321020303. The next prime is 321020339. The reversal of 321020317 is 713020123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 317873241 + 3147076 = 17829^2 + 1774^2 .

It is an emirp because it is prime and its reverse (713020123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321020317 - 2²⁷ = 186802589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 321020294 and 321020303.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321020017) 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, 160510158 + 160510159.

It is an arithmetic number, because the mean of its divisors is an integer number (160510159).

Almost surely, 2^321020317 is an apocalyptic number.

It is an amenable number.

321020317 is a deficient number, since it is larger than the sum of its proper divisors (1).

321020317 is an equidigital number, since it uses as much as digits as its factorization.

321020317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 321020317 is about 17917.0398503771. The cubic root of 321020317 is about 684.7165730320.

The spelling of 321020317 in words is "three hundred twenty-one million, twenty thousand, three hundred seventeen".