Il numero romano MCLXXXI nel sistema decimale vale: 1181.
MCLXXXI in latino si scrive mille centum octoginta unus,
mentre in italiano millecentottantuno.
MCLXII, MCLXIII, MCLXIV, MCLXV, MCLXVI, MCLXVII, MCLXVIII, MCLXIX, MCLXX, MCLXXI, MCLXXII, MCLXXIII, MCLXXIV, MCLXXV, MCLXXVI, MCLXXVII, MCLXXVIII, MCLXXIX, MCLXXX, MCLXXXII, MCLXXXIII, MCLXXXIV, MCLXXXV, MCLXXXVI, MCLXXXVII, MCLXXXVIII, MCLXXXIX, MCXC, MCXCI, MCXCII, MCXCIII, MCXCIV, MCXCV, MCXCVI, MCXCVII, MCXCVIII, MCXCIX, MCC