1. Numbers
  2. Compare 1981 vs 1990

Compare 1981 vs 1990

Property19811990
Typesemiprimecomposite number
Unique factors23
Total factors23
Prime factorization71 × 283121 × 51 × 1991
Prime factorization7 × 2832 × 5 × 199
Divisors count48
Divisors1, 7, 283, 19811, 2, 5, 10, 199, 398, 995, 1990
Number of properties10
Semiprimes572nd 
Roman numberalsMCMLXXXIMCMXC
Base 2111101111012111110001102
Base 32201101322012013
Base 413233141330124
Base 5304115304305
Base 6131016131146
Base 75530755427
Base 83675837068
Base 92641926519
Base 10198110199010
Base 11154111154a11
Base 12119112119a12
Base 13b9513ba113
Base 14a1714a2214
Base 158c1158ca15
Base 167bd167c616
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