1. Numbers
  2. Compare 199819 vs 199921

Compare 199819 vs 199921

Property199819199921
Typeprimeprime
Unique factors11
Total factors11
Prime factorization19981911999211
Prime factorization199819199921
Divisors count22
Divisors1, 1998191, 199921
Number of properties75
Additive primes7216th7221st
Isolated primes13655th13662nd
Long primes6735th 
Lucky primes2315th 
Primes17972nd17979th
Pythagorean primes 8975th
Sexy primes (2nd member)4294th 
Sexy prime triplets (3rd member)865th 
Ulam primes 1289th
Roman numberals  
Base 211000011001000101121100001100111100012
Base 310101100220131010110201113
Base 430030202343003033014
Base 5223432345223441415
Base 64141031641413216
Base 71461364714616017
Base 860621386063618
Base 933408193342149
Base 101998191019992110
Base 111271441112722711
Base 1297777129784112
Base 136cc49136ccc713
Base 1452b6b1452c0114
Base 153e314153e38115
Base 1630c8b1630cf116
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