Hecho general: 511 is the number of collaborators mathematician Paul Erdős had.
Hecho matemático: 511 is an unremarkable number.
Trivia: 511 is the number of collaborators mathematician Paul Erdős had.
Fecha histórica: May 25th is the day in 1926 that Sholom Schwartzbard assassinates Symon Petliura, the head of the Paris-based government-in-exile of Ukrainian People's Republic.