Hecho general: 4173 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 4173 is an unremarkable number.
Trivia: 4173 is an unremarkable number.
Fecha histórica: June 4th is the day in 1957 that Dr. Martin Luther King, Jr. delivered his famous Power of Nonviolence speech at the University of California, Berkeley.