Fatto generale: 4971 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 4971 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 4971 is an uninteresting number.
Data storica: August 10th is the day in 1628 that the Swedish warship Vasa sinks in the Stockholm harbour after only about 20 minutes of her maiden voyage.