Il numero romano MMCMLXI nel sistema decimale vale: 2961.
MMCMLXI in latino si scrive duo milia nongenti sexaginta unus,
mentre in italiano duemilanovecentosessantuno.
MMCMXLII, MMCMXLIII, MMCMXLIV, MMCMXLV, MMCMXLVI, MMCMXLVII, MMCMXLVIII, MMCMXLIX, MMCML, MMCMLI, MMCMLII, MMCMLIII, MMCMLIV, MMCMLV, MMCMLVI, MMCMLVII, MMCMLVIII, MMCMLIX, MMCMLX, MMCMLXII, MMCMLXIII, MMCMLXIV, MMCMLXV, MMCMLXVI, MMCMLXVII, MMCMLXVIII, MMCMLXIX, MMCMLXX, MMCMLXXI, MMCMLXXII, MMCMLXXIII, MMCMLXXIV, MMCMLXXV, MMCMLXXVI, MMCMLXXVII, MMCMLXXVIII, MMCMLXXIX, MMCMLXXX