Hecho general: 1309 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 1309 is a member of the Fibonacci-type sequence starting with 1 and 5.
Trivia: 1309 is an uninteresting number.
Fecha histórica: August 1st is the day in 1966 that Charles Whitman kills 16 people at The University of Texas at Austin before being killed by the police.