Il numero romano MMCMLXXXI nel sistema decimale vale: 2981.
MMCMLXXXI in latino si scrive duo milia nongenti octoginta unus,
mentre in italiano duemilanovecentottantuno.
MMCMLXII, MMCMLXIII, MMCMLXIV, MMCMLXV, MMCMLXVI, MMCMLXVII, MMCMLXVIII, MMCMLXIX, MMCMLXX, MMCMLXXI, MMCMLXXII, MMCMLXXIII, MMCMLXXIV, MMCMLXXV, MMCMLXXVI, MMCMLXXVII, MMCMLXXVIII, MMCMLXXIX, MMCMLXXX, MMCMLXXXII, MMCMLXXXIII, MMCMLXXXIV, MMCMLXXXV, MMCMLXXXVI, MMCMLXXXVII, MMCMLXXXVIII, MMCMLXXXIX, MMCMXC, MMCMXCI, MMCMXCII, MMCMXCIII, MMCMXCIV, MMCMXCV, MMCMXCVI, MMCMXCVII, MMCMXCVIII, MMCMXCIX, MMM