Il numero romano MMMMLXXXI nel sistema decimale vale: 4081.
MMMMLXXXI in latino si scrive quattuor milia octoginta unus,
mentre in italiano quattromilaottantuno.
MMMMLXII, MMMMLXIII, MMMMLXIV, MMMMLXV, MMMMLXVI, MMMMLXVII, MMMMLXVIII, MMMMLXIX, MMMMLXX, MMMMLXXI, MMMMLXXII, MMMMLXXIII, MMMMLXXIV, MMMMLXXV, MMMMLXXVI, MMMMLXXVII, MMMMLXXVIII, MMMMLXXIX, MMMMLXXX, MMMMLXXXII, MMMMLXXXIII, MMMMLXXXIV, MMMMLXXXV, MMMMLXXXVI, MMMMLXXXVII, MMMMLXXXVIII, MMMMLXXXIX, MMMMXC, MMMMXCI, MMMMXCII, MMMMXCIII, MMMMXCIV, MMMMXCV, MMMMXCVI, MMMMXCVII, MMMMXCVIII, MMMMXCIX, MMMMC