Il numero romano MMDCLXXXI nel sistema decimale vale: 2681.
MMDCLXXXI in latino si scrive duo milia sescenti octoginta unus,
mentre in italiano duemilaseicentottantuno.
MMDCLXII, MMDCLXIII, MMDCLXIV, MMDCLXV, MMDCLXVI, MMDCLXVII, MMDCLXVIII, MMDCLXIX, MMDCLXX, MMDCLXXI, MMDCLXXII, MMDCLXXIII, MMDCLXXIV, MMDCLXXV, MMDCLXXVI, MMDCLXXVII, MMDCLXXVIII, MMDCLXXIX, MMDCLXXX, MMDCLXXXII, MMDCLXXXIII, MMDCLXXXIV, MMDCLXXXV, MMDCLXXXVI, MMDCLXXXVII, MMDCLXXXVIII, MMDCLXXXIX, MMDCXC, MMDCXCI, MMDCXCII, MMDCXCIII, MMDCXCIV, MMDCXCV, MMDCXCVI, MMDCXCVII, MMDCXCVIII, MMDCXCIX, MMDCC