91 is the product of two prime numbers: 7 and 13. Other than this, it cannot be divided into whole parts.
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1, 7, 13, 91.
The HCF of the given numbers is 13
5 of them.
Each of these do: 1, 2, 3, 6, 7, 13, 14, 21, 26, 39, 42, 78, 91, 182, 273, 546.
The least common multiple of 7 and 13 is 91. Because the numbers in the set are prime, their LCM is their product.