320321317 has 2 divisors, whose sum is σ = 320321318. Its totient is φ = 320321316.

The previous prime is 320321303. The next prime is 320321333. The reversal of 320321317 is 713123023.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 319372641 + 948676 = 17871^2 + 974^2 .

It is an emirp because it is prime and its reverse (713123023) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 320321317 - 2¹⁹ = 319797029 is a prime.

It is a super-2 number, since 2×320321317² = 205211492249228978, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320321377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160160658 + 160160659.

It is an arithmetic number, because the mean of its divisors is an integer number (160160659).

Almost surely, 2^320321317 is an apocalyptic number.

It is an amenable number.

320321317 is a deficient number, since it is larger than the sum of its proper divisors (1).

320321317 is an equidigital number, since it uses as much as digits as its factorization.

320321317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 22.

The square root of 320321317 is about 17897.5226497971. The cubic root of 320321317 is about 684.2192372298.

The spelling of 320321317 in words is "three hundred twenty million, three hundred twenty-one thousand, three hundred seventeen".