Il numero romano CCCXVII nel sistema decimale vale: 317.
CCCXVII in latino si scrive trecenti septemdecim,
mentre in italiano trecentodiciassette.
CCXCVIII, CCXCIX, CCC, CCCI, CCCII, CCCIII, CCCIV, CCCV, CCCVI, CCCVII, CCCVIII, CCCIX, CCCX, CCCXI, CCCXII, CCCXIII, CCCXIV, CCCXV, CCCXVI, CCCXVIII, CCCXIX, CCCXX, CCCXXI, CCCXXII, CCCXXIII, CCCXXIV, CCCXXV, CCCXXVI, CCCXXVII, CCCXXVIII, CCCXXIX, CCCXXX, CCCXXXI, CCCXXXII, CCCXXXIII, CCCXXXIV, CCCXXXV, CCCXXXVI