1. Numbers
  2. Compare 18911 vs 18921

Compare 18911 vs 18921

Property1891118921
Typeprimecomposite number
Unique factors14
Total factors14
Prime factorization18911131 × 71 × 171 × 531
Prime factorization189113 × 7 × 17 × 53
Divisors count216
Divisors1, 189111, 3, 7, 17, 21, 51, 53, 119, 159, 357, 371, 901, 1113, 2703, 6307, 18921
Number of properties100
Centered decagonal primes32nd 
Chen primes1066th 
Emirps590th 
Good primes247th 
Harmonic primes775th 
Primes2151st 
Prime quadruplets (1st member)18th 
Prime triplets (1st member)161st 
Sexy primes (1st member)658th 
Twin primes (1st member)326th 
Roman numberals  
Base 210010011101111121001001111010012
Base 322122110232212212103
Base 4102131334102132214
Base 51101121511011415
Base 622331562233336
Base 710606471061107
Base 8447378447518
Base 9278429278539
Base 1018911101892110
Base 1113232111324111
Base 12ab3b12ab4912
Base 1387b91387c613
Base 146c6b146c7714
Base 15590b15591615
Base 1649df1649e916
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