316321 has 2 divisors, whose sum is σ = 316322. Its totient is φ = 316320.

The previous prime is 316301. The next prime is 316339. The reversal of 316321 is 123613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 314721 + 1600 = 561^2 + 40^2 .

It is a cyclic number.

It is not a de Polignac number, because 316321 - 2⁷ = 316193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 316295 and 316304.

It is not a weakly prime, because it can be changed into another prime (316301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158160 + 158161.

It is an arithmetic number, because the mean of its divisors is an integer number (158161).

2³¹⁶³²¹ is an apocalyptic number.

It is an amenable number.

316321 is a deficient number, since it is larger than the sum of its proper divisors (1).

316321 is an equidigital number, since it uses as much as digits as its factorization.

316321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108, while the sum is 16.

The square root of 316321 is about 562.4242171173. The cubic root of 316321 is about 68.1359017988.

Adding to 316321 its reverse (123613), we get a palindrome (439934).

The spelling of 316321 in words is "three hundred sixteen thousand, three hundred twenty-one".