1. Numbers
  2. Compare 1285 vs 1291

Compare 1285 vs 1291

Property12851291
Typesemiprimeprime
Unique factors21
Total factors21
Prime factorization51 × 257112911
Prime factorization5 × 2571291
Divisors count42
Divisors1, 5, 257, 12851, 1291
Number of properties19
Additive primes 113th
Chen primes 137th
Harmonic primes 73rd
Long primes 80th
Lucky primes 54th
Primes 210th
Semiprimes378th 
Sexy primes (1st member) 91st
Sexy prime triplets (1st member) 35th
Twin primes (2nd member) 44th
Roman numberalsMCCLXXXVMCCXCI
Base 2101000001012101000010112
Base 31202121312022113
Base 411001141100234
Base 5201205201315
Base 65541655516
Base 73514735237
Base 82405824138
Base 91677916849
Base 10128510129110
Base 11a6911a7411
Base 128b1128b712
Base 1377b1378413
Base 1467b1468314
Base 155aa155b115
Base 165051650b16
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