Il numero romano MMMMDCCCXCI nel sistema decimale vale: 4891.
MMMMDCCCXCI in latino si scrive quattuor milia octingenti nonaginta unus,
mentre in italiano quattromilaottocentonovantuno.
MMMMDCCCLXXII, MMMMDCCCLXXIII, MMMMDCCCLXXIV, MMMMDCCCLXXV, MMMMDCCCLXXVI, MMMMDCCCLXXVII, MMMMDCCCLXXVIII, MMMMDCCCLXXIX, MMMMDCCCLXXX, MMMMDCCCLXXXI, MMMMDCCCLXXXII, MMMMDCCCLXXXIII, MMMMDCCCLXXXIV, MMMMDCCCLXXXV, MMMMDCCCLXXXVI, MMMMDCCCLXXXVII, MMMMDCCCLXXXVIII, MMMMDCCCLXXXIX, MMMMDCCCXC, MMMMDCCCXCII, MMMMDCCCXCIII, MMMMDCCCXCIV, MMMMDCCCXCV, MMMMDCCCXCVI, MMMMDCCCXCVII, MMMMDCCCXCVIII, MMMMDCCCXCIX, MMMMCM, MMMMCMI, MMMMCMII, MMMMCMIII, MMMMCMIV, MMMMCMV, MMMMCMVI, MMMMCMVII, MMMMCMVIII, MMMMCMIX, MMMMCMX