Find the missing term in the following series.
$$361,289,169,\_\_\_\_,49$$

The given series consists of the squares of consecutive decreasing prime numbers:
* $361=19^2$
* $289=17^2$
* $169=13^2$
* $\text{Missing term}=11^2=121$
* $49=7^2$

Therefore, the missing term is $121$.