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 Fools 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.)