Il numero romano MMCDLXI nel sistema decimale vale: 2461.
MMCDLXI in latino si scrive duo milia quadringenti sexaginta unus,
mentre in italiano duemilaquattrocentosessantuno.
MMCDXLII, MMCDXLIII, MMCDXLIV, MMCDXLV, MMCDXLVI, MMCDXLVII, MMCDXLVIII, MMCDXLIX, MMCDL, MMCDLI, MMCDLII, MMCDLIII, MMCDLIV, MMCDLV, MMCDLVI, MMCDLVII, MMCDLVIII, MMCDLIX, MMCDLX, MMCDLXII, MMCDLXIII, MMCDLXIV, MMCDLXV, MMCDLXVI, MMCDLXVII, MMCDLXVIII, MMCDLXIX, MMCDLXX, MMCDLXXI, MMCDLXXII, MMCDLXXIII, MMCDLXXIV, MMCDLXXV, MMCDLXXVI, MMCDLXXVII, MMCDLXXVIII, MMCDLXXIX, MMCDLXXX