Hecho matemático: 5133 is the smallest integer ratio of a 18-digit number to its product of digits.
Trivia: 5133 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fecha histórica: January 19th is the day in 1997 that Yasser Arafat returns to Hebron after more than 30 years and joins celebrations over the handover of the last Israeli-controlled West Bank city.