9
Explanation:
Each set of five digits follows a pattern. Here is the pattern for each set of five digits:
13681, 24792, 35913, 47124, 58335, 69546, 71067, 81278, 91489
1. The first digit increases by 2.
2. The second digit increases by 3.
3. The third digit increases by 4.
4. The fourth digit increases by 5.
5. The fifth digit increases by 6.
The following set of five digits would be 101891.