Fatto generale: 5187 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 5187 is the only number n known for which f(n-1) = f(n) = f(n+1).
Trivia: 5187 is an uninteresting number.
Data storica: March 14th is the day in 1967 that the body of President John F. Kennedy is moved to a permanent burial place at Arlington National Cemetery.