1. Numbers
  2. Compare 1987 vs 1999

Compare 1987 vs 1999

Property19871999
Typeprimeprime
Unique factors11
Total factors11
Prime factorization1987119991
Prime factorization19871999
Divisors count22
Divisors1, 19871, 1999
Number of properties68
Centered triangular primes 10th
Cousin primes (1st member) 65th
Good primes62nd 
Isolated primes181st 
Lucky primes70th 
Primes300th303rd
Prime triplets (2nd member) 50th
Prime triplets (3rd member) 49th
Sexy primes (1st member)127th 
Sexy primes (2nd member) 128th
Sexy prime triplets (1st member)50th 
Sexy prime triplets (3rd member) 50th
Twin primes (2nd member) 61st
Roman numberalsMCMLXXXVIIMCMXCIX
Base 2111110000112111110011112
Base 32201121322020013
Base 413300341330334
Base 5304225304445
Base 6131116131316
Base 75536755547
Base 83703837178
Base 92647926619
Base 10198710199910
Base 11154711155811
Base 1211971211a712
Base 13b9b13baa13
Base 14a1d14a2b14
Base 158c7158d415
Base 167c3167cf16
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