Il numero romano MDCXI nel sistema decimale vale: 1611.
MDCXI in latino si scrive mille sescenti undecim,
mentre in italiano milleseicentoundici.
MDXCII, MDXCIII, MDXCIV, MDXCV, MDXCVI, MDXCVII, MDXCVIII, MDXCIX, MDC, MDCI, MDCII, MDCIII, MDCIV, MDCV, MDCVI, MDCVII, MDCVIII, MDCIX, MDCX, MDCXII, MDCXIII, MDCXIV, MDCXV, MDCXVI, MDCXVII, MDCXVIII, MDCXIX, MDCXX, MDCXXI, MDCXXII, MDCXXIII, MDCXXIV, MDCXXV, MDCXXVI, MDCXXVII, MDCXXVIII, MDCXXIX, MDCXXX