No they are not.
No. They are both divisible by 3.
79
The GCF of 81 and 87 is 3.
87 + 81 + 80 + 90 + 87 + 75 = 500/6 = 83.3 recurring (that is, 83.3333...)
The prime factorization of 87 is 1,3,29, and 87
81 is not prime, it is composite.
81 is not prime it's a composite number
168 - 87 = 81
87 is NOT a prime number.
The factors of 87 are 1, 3, 29, and 87. The prime factors of 87 are 3 and 29. The prime factorization of 87 is 3 * 29.
81.