Fatto matematico: 819 is the smallest number so that it and its successor are both the product of 2 primes and the square of a prime.
Trivia: 819 is an unremarkable number.
Data storica: March 29th is the day in 1999 that the Dow Jones Industrial Average closes above the 10,000 mark (10,006.78) for the first time, during the height of the internet boom.