Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Episode no. | Airdate | Viewers | BBC Three weekly ranking | Cable rank |
| --- | --- | --- | --- | --- |
| 1.0 | 22 October 2009 | 492000.0 | N/A | N/A |
| 2.0 | 29 October 2009 | 515000.0 | N/A | N/A |
| 3.0 | 5 November 2009 | 818000.0 | 3 | 15 |
| 4.0 | 12 November 2009 | 598000.0 | 10 | N/A |
| 5.0 | 19 November 2009 | 656000.0 | 7 | N/A |
| 6.0 | 26 November 2009 | 849000.0 | 4 | 15 |
| 7.0 | 3 December 2009 | 648000.0 | 7 | N/A |
| 8.0 | 10 December 2009 | 705000.0 | 6 | 19 |
Question:
How many viewers were there for airdate is 22 october 2009?
Answer:
492000.0