19001

This number is a prime.

+

        A "Bemirpyramid" of length 18:

                 16819001081
                1110190011011
               109001900111081
              10188119001111991
             1000069190011198661
            100000091900110080961
           10000000019001108808801
          1000000000190011096011191
         180000000011900101810819901
        18000000001019001001888899001
       1800000008100190010001606068101
      180000000810001900100001161611891
     18000000081000019001000001669190061
    1800000008100000190010000001996886801
   180000000900000001900100000001601081801
  18000000086000000019001000000001890961611
 1900000009100000000190010000000001081108611
190000000960000000001900100000000001189198681
 Found by Metin Sariyar of Istanbul, Turkey.

+ The smallest bemirp that is the sum of seven consecutive "April Fool primes" (2701 + 2703 + 2709 + 2717 + 2721 + 2723 + 2727). [Bajpai]

+ The larger of only two 5-digit ZIP Codes that are bemirps. It belongs to Abington Township, PA. (You can find the other location by inverting 19001, then reading it backwards.)

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