317 has 2 divisors, whose sum is σ = 318.
Its totient is φ = 316.
The previous prime is 313. The next prime is 331. The reversal of 317 is 713.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 196 + 121 = 14^2 + 11^2
317 is a truncatable prime.
It is a cyclic number.
It is not a de Polignac number, because 317 - 22 = 313 is a prime.
It is a Chen prime.
It is a plaindrome in base 6, base 11, base 12, base 14 and base 16.
It is a nialpdrome in base 7.
It is a junction number, because it is equal to n+sod(n) for n = 298 and 307.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (311) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158 + 159.
It is an arithmetic number, because the mean of its divisors is an integer number (159).
It is an amenable number.
317 is a deficient number, since it is larger than the sum of its proper divisors (1).
317 is an equidigital number, since it uses as much as digits as its factorization.
317 is an evil number, because the sum of its binary digits is even.
The product of its digits is 21, while the sum is 11.
The square root of 317 is about 17.8044938148.
The cubic root of 317 is about 6.8184619414.
The spelling of 317 in words is "three hundred seventeen", and is thus an aban number, an iban number, and an oban number.