Il numero romano MMMMCMLXXI nel sistema decimale vale: 4971.
MMMMCMLXXI in latino si scrive quattuor milia nongenti septuaginta unus,
mentre in italiano quattromilanovecentosettantuno.
MMMMCMLII, MMMMCMLIII, MMMMCMLIV, MMMMCMLV, MMMMCMLVI, MMMMCMLVII, MMMMCMLVIII, MMMMCMLIX, MMMMCMLX, MMMMCMLXI, MMMMCMLXII, MMMMCMLXIII, MMMMCMLXIV, MMMMCMLXV, MMMMCMLXVI, MMMMCMLXVII, MMMMCMLXVIII, MMMMCMLXIX, MMMMCMLXX, MMMMCMLXXII, MMMMCMLXXIII, MMMMCMLXXIV, MMMMCMLXXV, MMMMCMLXXVI, MMMMCMLXXVII, MMMMCMLXXVIII, MMMMCMLXXIX, MMMMCMLXXX, MMMMCMLXXXI, MMMMCMLXXXII, MMMMCMLXXXIII, MMMMCMLXXXIV, MMMMCMLXXXV, MMMMCMLXXXVI, MMMMCMLXXXVII, MMMMCMLXXXVIII, MMMMCMLXXXIX, MMMMCMXC