Il numero romano MDXXXI nel sistema decimale vale: 1531.
MDXXXI in latino si scrive mille quingenti triginta unus,
mentre in italiano millecinquecentotrentuno.
MDXII, MDXIII, MDXIV, MDXV, MDXVI, MDXVII, MDXVIII, MDXIX, MDXX, MDXXI, MDXXII, MDXXIII, MDXXIV, MDXXV, MDXXVI, MDXXVII, MDXXVIII, MDXXIX, MDXXX, MDXXXII, MDXXXIII, MDXXXIV, MDXXXV, MDXXXVI, MDXXXVII, MDXXXVIII, MDXXXIX, MDXL, MDXLI, MDXLII, MDXLIII, MDXLIV, MDXLV, MDXLVI, MDXLVII, MDXLVIII, MDXLIX, MDL