1. Numbers
  2. Compare 1981 vs 1987

Compare 1981 vs 1987

Property19811987
Typesemiprimeprime
Unique factors21
Total factors21
Prime factorization71 × 283119871
Prime factorization7 × 2831987
Divisors count42
Divisors1, 7, 283, 19811, 1987
Number of properties16
Good primes 62nd
Isolated primes 181st
Lucky primes 70th
Primes 300th
Semiprimes572nd 
Sexy primes (1st member) 127th
Sexy prime triplets (1st member) 50th
Roman numberalsMCMLXXXIMCMLXXXVII
Base 2111101111012111110000112
Base 32201101322011213
Base 413233141330034
Base 5304115304225
Base 6131016131116
Base 75530755367
Base 83675837038
Base 92641926479
Base 10198110198710
Base 11154111154711
Base 12119112119712
Base 13b9513b9b13
Base 14a1714a1d14
Base 158c1158c715
Base 167bd167c316
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