math_fact: 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.
historical_date: March 29th is the day in 1500 that Cesare Borgia is given the title of Captain General and Gonfalonier by his father Rodrigo Borgia after returning from his conquests in the Romagna.