1. Numbers
  2. Compare 1991 vs 1999

Compare 1991 vs 1999

Property19911999
Typesemiprimeprime
Unique factors21
Total factors21
Prime factorization111 × 181119991
Prime factorization11 × 1811999
Divisors count42
Divisors1, 11, 181, 19911, 1999
Number of properties18
Centered triangular primes 10th
Cousin primes (1st member) 65th
Primes 303rd
Prime triplets (2nd member) 50th
Prime triplets (3rd member) 49th
Semiprimes576th 
Sexy primes (2nd member) 128th
Sexy prime triplets (3rd member) 50th
Twin primes (2nd member) 61st
Roman numberalsMCMXCIMCMXCIX
Base 2111110001112111110011112
Base 32201202322020013
Base 413301341330334
Base 5304315304445
Base 6131156131316
Base 75543755547
Base 83707837178
Base 92652926619
Base 10199110199910
Base 11155011155811
Base 12119b1211a712
Base 13ba213baa13
Base 14a2314a2b14
Base 158cb158d415
Base 167c7167cf16
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