1. Numbers
  2. Compare 991 vs 1001

Compare 991 vs 1001

Property9911001
Typeprimecomposite number
Unique factors13
Total factors13
Prime factorization991171 × 111 × 131
Prime factorization9917 × 11 × 13
Divisors count28
Divisors1, 9911, 7, 11, 13, 77, 91, 143, 1001
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 numberalsCMXCIMI
Base 21111011111211111010012
Base 31100201311010023
Base 4331334332214
Base 5124315130015
Base 64331643456
Base 72614726307
Base 81737817518
Base 91321913329
Base 1099110100110
Base 118211183011
Base 126a7126b512
Base 135b3135c013
Base 1450b1451714
Base 154611546b15
Base 163df163e916
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