general_fact: 47315 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 47315 is an uninteresting number.
trivia: 47315 is an uninteresting number.
historical_date: July 17th is the day in 1402 that Zhu Di, better known by his era name as the Yongle Emperor, assumes the throne over the Ming Dynasty of China.