Il numero romano MDI nel sistema decimale vale: 1501.
MDI in latino si scrive mille quingenti unus,
mentre in italiano millecinquecentouno.
MCDLXXXII, MCDLXXXIII, MCDLXXXIV, MCDLXXXV, MCDLXXXVI, MCDLXXXVII, MCDLXXXVIII, MCDLXXXIX, MCDXC, MCDXCI, MCDXCII, MCDXCIII, MCDXCIV, MCDXCV, MCDXCVI, MCDXCVII, MCDXCVIII, MCDXCIX, MD, MDII, MDIII, MDIV, MDV, MDVI, MDVII, MDVIII, MDIX, MDX, MDXI, MDXII, MDXIII, MDXIV, MDXV, MDXVI, MDXVII, MDXVIII, MDXIX, MDXX