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Re: What is the largest prime number by which 871 is exactly divisible? [#permalink]
Is there any other way apart from prime factorisation to solve this?
It is easy for small numbers but for large ones its a bit tedious
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Re: What is the largest prime number by which 871 is exactly divisible? [#permalink]
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Eliminate 11 as the sum of digits at alternating places is not 0 or a multiple of 11.
When you shall check for the divisibility with 13,you would observe that 13x67=871 and since 67 is a prime number, answer option c is the appropriate choice.
(option c)

Devmitra Sen
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Re: What is the largest prime number by which 871 is exactly divisible? [#permalink]
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