Looking on the internet deeply has found these results:

It is worthwhile to mention is the most popular phrase on the web.

It is worthwhile mentioning 181,500 results on the web	It is worthwhile to mention 1433,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Nonetheless, it is worthwhile to recall nature conservation instruments by means of an appropriate reference. It is worthwhile exploring whether this model for cooperation and innovation could also prove useful for other Framework Programme activities. It is worthwhile having a separate category of 'intermediate' bodies and to describe them. In this context it is worthwhile mentioning a study carried out by the EEVC into restraint systems for children under three years of age. It is worthwhile mentioning that the first Report adopted by the new Committee concerned the activity of the European Ombudsman It is worthwhile visiting the museum. It is worthwhile underlining that the latter sent about 300 communications referring to petitions registered in 2009. In addition to the above definition, it is worthwhile mentioning another, more significant one from a scientific point of view.	It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

It is worthwhile mentioning

181,500 results on the web

It is worthwhile to mention

1433,000 results on the web

More popular!

Nonetheless, it is worthwhile to recall nature conservation instruments by means of an appropriate reference.
It is worthwhile exploring whether this model for cooperation and innovation could also prove useful for other Framework Programme activities.
It is worthwhile having a separate category of 'intermediate' bodies and to describe them.
In this context it is worthwhile mentioning a study carried out by the EEVC into restraint systems for children under three years of age.
It is worthwhile mentioning that the first Report adopted by the new Committee concerned the activity of the European Ombudsman
It is worthwhile visiting the museum.
It is worthwhile underlining that the latter sent about 300 communications referring to petitions registered in 2009.
In addition to the above definition, it is worthwhile mentioning another, more significant one from a scientific point of view.

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.