Il numero romano MMMMCXXXI nel sistema decimale vale: 4131.
MMMMCXXXI in latino si scrive quattuor milia centum triginta unus,
mentre in italiano quattromilacentotrentuno.
MMMMCXII, MMMMCXIII, MMMMCXIV, MMMMCXV, MMMMCXVI, MMMMCXVII, MMMMCXVIII, MMMMCXIX, MMMMCXX, MMMMCXXI, MMMMCXXII, MMMMCXXIII, MMMMCXXIV, MMMMCXXV, MMMMCXXVI, MMMMCXXVII, MMMMCXXVIII, MMMMCXXIX, MMMMCXXX, MMMMCXXXII, MMMMCXXXIII, MMMMCXXXIV, MMMMCXXXV, MMMMCXXXVI, MMMMCXXXVII, MMMMCXXXVIII, MMMMCXXXIX, MMMMCXL, MMMMCXLI, MMMMCXLII, MMMMCXLIII, MMMMCXLIV, MMMMCXLV, MMMMCXLVI, MMMMCXLVII, MMMMCXLVIII, MMMMCXLIX, MMMMCL