Il numero romano MMMMDCCXCI nel sistema decimale vale: 4791.
MMMMDCCXCI in latino si scrive quattuor milia septingenti nonaginta unus,
mentre in italiano quattromilasettecentonovantuno.
MMMMDCCLXXII, MMMMDCCLXXIII, MMMMDCCLXXIV, MMMMDCCLXXV, MMMMDCCLXXVI, MMMMDCCLXXVII, MMMMDCCLXXVIII, MMMMDCCLXXIX, MMMMDCCLXXX, MMMMDCCLXXXI, MMMMDCCLXXXII, MMMMDCCLXXXIII, MMMMDCCLXXXIV, MMMMDCCLXXXV, MMMMDCCLXXXVI, MMMMDCCLXXXVII, MMMMDCCLXXXVIII, MMMMDCCLXXXIX, MMMMDCCXC, MMMMDCCXCII, MMMMDCCXCIII, MMMMDCCXCIV, MMMMDCCXCV, MMMMDCCXCVI, MMMMDCCXCVII, MMMMDCCXCVIII, MMMMDCCXCIX, MMMMDCCC, MMMMDCCCI, MMMMDCCCII, MMMMDCCCIII, MMMMDCCCIV, MMMMDCCCV, MMMMDCCCVI, MMMMDCCCVII, MMMMDCCCVIII, MMMMDCCCIX, MMMMDCCCX