What is the Greatest Common Factor of 861 and 865?
Greatest common factor (GCF) of 861 and 865 is 1.
GCF(861,865) = 1
We will now calculate the prime factors of 861 and 865, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 861 and 865.
How to find the GCF of 861 and 865?
We will first find the prime factorization of 861 and 865. After we will calculate the factors of 861 and 865 and find the biggest common factor number .
Step-1: Prime Factorization of 861
Prime factors of 861 are 3, 7, 41. Prime factorization of 861 in exponential form is:
861 = 31 × 71 × 411
Step-2: Prime Factorization of 865
Prime factors of 865 are 5, 173. Prime factorization of 865 in exponential form is:
865 = 51 × 1731
Step-3: Factors of 861
List of positive integer factors of 861 that divides 861 without a remainder.
1, 3, 7, 21, 41, 123, 287
Step-4: Factors of 865
List of positive integer factors of 865 that divides 861 without a remainder.
1, 5, 173
Final Step: Biggest Common Factor Number
We found the factors and prime factorization of 861 and 865. The biggest common factor number is the GCF number.
So the greatest common factor 861 and 865 is 1.
Also check out the Least Common Multiple of 861 and 865
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