Fatto generale: 8135 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 8135 is the 7^{th} central pentanomial coefficient.
Trivia: 8135 is a boring number.
Data storica: April 9th is the day in 1969 that the "Chicago Eight" plead not guilty to federal charges of conspiracy to incite a riot at the 1968 Democratic National Convention in Chicago, Illinois.