Hecho general: 7170 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 7170 is a value of n for which s(n-1) = s(n+1).
Trivia: 7170 is an unremarkable number.
Fecha histórica: August 18th is the day in 1950 that Julien Lahaut, the chairman of the Communist Party of Belgium is assassinated by far-right elements.