1. Numbers
  2. Compare 19987 vs 19991

Compare 19987 vs 19991

Property1998719991
Typecomposite numberprime
Unique factors31
Total factors31
Prime factorization111 × 231 × 791199911
Prime factorization11 × 23 × 7919991
Divisors count82
Divisors1, 11, 23, 79, 253, 869, 1817, 199871, 19991
Number of properties09
Additive primes 1049th
Chen primes 1111th
Harmonic primes 820th
Palindromic primes 46th
Primes 2260th
Prime triplets (1st member) 168th
Sexy primes (1st member) 693rd
Sophie germain primes 326th
Twin primes (1st member) 342nd
Roman numberals  
Base 210011100001001121001110000101112
Base 31000102021310001021023
Base 4103201034103201134
Base 51114422511144315
Base 623231162323156
Base 711216271121667
Base 8470238470278
Base 9303679303729
Base 1019987101999110
Base 1114020111402411
Base 12b69712b69b12
Base 13913613913a13
Base 1473d91473dd14
Base 155dc7155dcb15
Base 164e13164e1716
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