General fact: 1251 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 1251 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 1251 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Historical date: June 4th is the day in 1920 that Hungary loses 71% of its territory and 63% of its population when the Treaty of Trianon is signed in Paris.