347 is the smallest prime such that the product of its digits is equal to 2 times the number of digits times the sum of digits: 3 x 4 x 7 = 2(3 x (3 + 4 + 7).
347 is the largest three-digit prime that remains prime when 2 is added to any of its digits: 547, 367, and 349 are primes.
347 and 349 form a twin prime pair.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgzS9Fwv1TYdaT83hBc6kH1eFqcp0qn7F6jLzyLskIEUGqqNFH68yMtL35ARW8Z_81N18FucwW0L28jFg9gLwlUtkpm2bfZfEh6gPBjisn9m7Z5CTJhLgP89pDKop1ap21QUPKC9K2IlZU/s400/n0347.jpg)
Dracula's fictional London house was located at 347 Piccadilly, according to Leslie S. Klinger's book The New Annotated Dracula.
Source: Prime Curios!
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgzS9Fwv1TYdaT83hBc6kH1eFqcp0qn7F6jLzyLskIEUGqqNFH68yMtL35ARW8Z_81N18FucwW0L28jFg9gLwlUtkpm2bfZfEh6gPBjisn9m7Z5CTJhLgP89pDKop1ap21QUPKC9K2IlZU/s400/n0347.jpg)
Dracula's fictional London house was located at 347 Piccadilly, according to Leslie S. Klinger's book The New Annotated Dracula.
Source: Prime Curios!
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