Il numero romano MDCLXXXI nel sistema decimale vale: 1681.
MDCLXXXI in latino si scrive mille sescenti octoginta unus,
mentre in italiano milleseicentottantuno.
MDCLXII, MDCLXIII, MDCLXIV, MDCLXV, MDCLXVI, MDCLXVII, MDCLXVIII, MDCLXIX, MDCLXX, MDCLXXI, MDCLXXII, MDCLXXIII, MDCLXXIV, MDCLXXV, MDCLXXVI, MDCLXXVII, MDCLXXVIII, MDCLXXIX, MDCLXXX, MDCLXXXII, MDCLXXXIII, MDCLXXXIV, MDCLXXXV, MDCLXXXVI, MDCLXXXVII, MDCLXXXVIII, MDCLXXXIX, MDCXC, MDCXCI, MDCXCII, MDCXCIII, MDCXCIV, MDCXCV, MDCXCVI, MDCXCVII, MDCXCVIII, MDCXCIX, MDCC