Fatto generale: 19391 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 19391 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 19391 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: February 1st is the day in 1709 that Alexander Selkirk is rescued after being shipwrecked on a desert island, inspiring the book Robinson Crusoe by Daniel Defoe.