813 = 3 x 271.
813 are the first three digits of 813e.
813 is 393 in base 15.
813 is a divisor of 99999 (A027893) and 9999999999 (A027895): 99999/813 = 123 and 9999999999/813 = 12300123.
813 is the concatenation of the sixth Fibonacci number and the sixth prime (A138821).
Source: What's Special About This Number?
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