Il numero 1991, millenovecentonovantuno in Italiano, in Inglese si dice one thousand nine hundred ninety-one.
Il numero ordinale 1991° in inglese si dice one thousand nine hundred ninety-first.
1982: one thousand nine hundred eighty-two
1983: one thousand nine hundred eighty-three
1984: one thousand nine hundred eighty-four
1985: one thousand nine hundred eighty-five
1986: one thousand nine hundred eighty-six
1987: one thousand nine hundred eighty-seven
1988: one thousand nine hundred eighty-eight
1989: one thousand nine hundred eighty-nine
1990: one thousand nine hundred ninety
1992: one thousand nine hundred ninety-two
1993: one thousand nine hundred ninety-three
1994: one thousand nine hundred ninety-four
1995: one thousand nine hundred ninety-five
1996: one thousand nine hundred ninety-six
1997: one thousand nine hundred ninety-seven
1998: one thousand nine hundred ninety-eight
1999: one thousand nine hundred ninety-nine
2000: two thousand