general_fact: 4181 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 4181 is the first composite number in the Fibonacci sequence with a prime index.
trivia: 4181 is a boring number.
historical_date: June 12th is the day in 1993 that an election takes place in Nigeria which and is later annulled by the military Government led by Ibrahim Babangida.