Hecho general: 7031 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 7031 is an uninteresting number.
Trivia: 7031 is an unremarkable number.
Fecha histórica: April 1st is the day in 325 that Crown Prince Jin Chengdi, age 4, succeeds his father Jin Mingdi as emperor of the Eastern Jin Dynasty.