Problem 42411. Divisible by 9

Pursuant to the first problem in this series, this one involves checking for divisibility by 9.

Write a function to determine if a number is divisible by 9. This can be done by the following method:

  1. Sum the digits of the number. As with methods for other numbers, this summing step can be applied recursively until a single-digit number results. If the resulting number is divisible by nine, then so is the original number.

Previous problem: divisible by 8. Next problem: divisible by 10.

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Solution Stats

62.66% Correct | 37.34% Incorrect
Last Solution submitted on Dec 10, 2025

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