Fatto matematico: 1571 is the smallest number that can not be formed using the digit 1 at most 23 times, together with the symbols +, –, × and ÷.
Trivia: 1571 is an uninteresting number.
Data storica: April 19th is the day in 1892 that Charles Duryea claims to have driven the first automobile in the United States, in Springfield, Massachusetts.