general_fact: 2811 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 2811 is the number of inequivalent Ferrers graphs with 30 points.
trivia: 2811 is an uninteresting number.
historical_date: September 11th is the day in 1961 that Hurricane Carla strikes the Texas coast as a Category 4 hurricane, the second strongest storm ever to hit the state.