1. Numbers
  2. Compare 991 vs 999

Compare 991 vs 999

Property991999
Typeprimecomposite number
Unique factors12
Total factors14
Prime factorization991133 × 371
Prime factorization9913 × 3 × 3 × 37
Divisors count28
Divisors1, 9911, 3, 9, 27, 37, 111, 333, 999
Number of properties100
Additive primes89th 
Chen primes115th 
Emirps36th 
Isolated primes98th 
Lucky primes42nd 
Primes167th 
Sexy primes (1st member)74th 
Solinas primes43rd 
Super primes39th 
Ulam primes18th 
Roman numberalsCMXCICMXCIX
Base 21111011111211111001112
Base 31100201311010003
Base 4331334332134
Base 5124315124445
Base 64331643436
Base 72614726257
Base 81737817478
Base 91321913309
Base 109911099910
Base 118211182911
Base 126a7126b312
Base 135b3135bb13
Base 1450b1451514
Base 154611546915
Base 163df163e716
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