Fatto generale: 8172 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 8172 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 8172 is an uninteresting number.
Data storica: May 16th is the day in 1975 that India annexes Sikkim after the mountain state holds a referendum in which the popular vote is in favor of merging with India.