1. Numbers
  2. Compare 247 vs 257

Compare 247 vs 257

Property247257
Typesemiprimeprime
Unique factors21
Total factors21
Prime factorization131 × 1912571
Prime factorization13 × 19257
Divisors count42
Divisors1, 13, 19, 2471, 257
Number of properties116
Chen primes 42nd
Fermat primes 4th
Good primes 20th
Isolated primes 22nd
Long primes 21st
Pierpont primes 14th
Primes 55th
Proth primes 10th
Pythagorean primes 25th
Quartan primes 4th
Semiprimes79th 
Sexy primes (1st member) 31st
Sexy primes (2nd member) 30th
Sexy prime quadrupletss (2nd member) 5th
Sexy prime triplets (1st member) 16th
Sexy prime triplets (2nd member) 15th
Solinas primes 31st
Roman numberalsCCXLVIICCLVII
Base 21111011121000000012
Base 310001131001123
Base 433134100014
Base 51442520125
Base 61051611056
Base 750275157
Base 836784018
Base 930493159
Base 102471025710
Base 112051121411
Base 121871219512
Base 131601316a13
Base 141391414514
Base 151171512215
Base 16f71610116
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