3131111111

3131111111 is a ten-digit decimal integer. In standard notation it equals 3,131,111,111.

The decimal representation uses only the digits 3 and 1, following the pattern 3-1-3-1-1-1-1-1-1-1. The digit sum is 14, so the number is not divisible by 3. The number is odd, so it is not divisible by 2 or 5. Based on the alternating-sum test for divisibility by 11, the sum of digits in odd positions is 9 and in even positions is 5; the difference is 4, so it is not divisible by 11. Without performing a full factorization, the number is not obviously divisible by small primes such as 7 or 13; a complete factorization would require computation. It is larger than the maximum value of a 32-bit signed integer but smaller than the maximum 32-bit unsigned integer, so it fits in 32-bit unsigned integers in common computing environments.

In telecommunications, if viewed as a North American Numbering Plan (NANP) sequence with area code 313, the remaining digits would form 111-1111. However, central office codes in NANP cannot be 111, so this would not be a valid NANP number. In other contexts, 3131111111 may be encountered as a numeric identifier, sample data, or a pattern used in testing and demonstrations.