Il numero romano MMMMDLXXI nel sistema decimale vale: 4571.
MMMMDLXXI in latino si scrive quattuor milia quingenti septuaginta unus,
mentre in italiano quattromilacinquecentosettantuno.
MMMMDLII, MMMMDLIII, MMMMDLIV, MMMMDLV, MMMMDLVI, MMMMDLVII, MMMMDLVIII, MMMMDLIX, MMMMDLX, MMMMDLXI, MMMMDLXII, MMMMDLXIII, MMMMDLXIV, MMMMDLXV, MMMMDLXVI, MMMMDLXVII, MMMMDLXVIII, MMMMDLXIX, MMMMDLXX, MMMMDLXXII, MMMMDLXXIII, MMMMDLXXIV, MMMMDLXXV, MMMMDLXXVI, MMMMDLXXVII, MMMMDLXXVIII, MMMMDLXXIX, MMMMDLXXX, MMMMDLXXXI, MMMMDLXXXII, MMMMDLXXXIII, MMMMDLXXXIV, MMMMDLXXXV, MMMMDLXXXVI, MMMMDLXXXVII, MMMMDLXXXVIII, MMMMDLXXXIX, MMMMDXC