309317 has 2 divisors, whose sum is σ = 309318. Its totient is φ = 309316.

The previous prime is 309313. The next prime is 309359. The reversal of 309317 is 713903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 306916 + 2401 = 554^2 + 49^2 .

It is an emirp because it is prime and its reverse (713903) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 309317 - 2² = 309313 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 309292 and 309301.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 309317.

It is not a weakly prime, because it can be changed into another prime (309311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154658 + 154659.

It is an arithmetic number, because the mean of its divisors is an integer number (154659).

2³⁰⁹³¹⁷ is an apocalyptic number.

It is an amenable number.

309317 is a deficient number, since it is larger than the sum of its proper divisors (1).

309317 is an equidigital number, since it uses as much as digits as its factorization.

309317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 567, while the sum is 23.

The square root of 309317 is about 556.1627459656. The cubic root of 309317 is about 67.6292539375.

It can be divided in two parts, 309 and 317, that added together give a palindrome (626).

The spelling of 309317 in words is "three hundred nine thousand, three hundred seventeen".