dumb & deaf

How can a deaf man without the help of anyone confirm that
he is not dumb?

15, 161, 1771, 19481, 214291,______?

Next number in the sequence
15, 161, 1771, 19481, 214291 is

Options:

1) 1942651
2) 135611101
3) 2424561
4) 1357101
5) 345372101
6) 1357201
7) 23651121
8) 1764924
9) 125461
10) 234255