Half of Americans don't know the pope is coming to the U.S.

Pope Francis waves as he arrives at St. Peter's Square in Vatican City on Aug. 4, 2015. (REUTERS/Giampiero Sposito)

More than half of Americans are unaware Pope Francis will be in Philadelphia and other U.S. cities next month.

In a survey released Tuesday, 52 percent of respondents said they had heard nothing about the pontiff's upcoming trip.

The survey, conducted by the nonpartisan Public Religion Research Institute and the Religion News Service, found that just 13 percent of Americans said they had heard a lot about the visit, with 34 percent responding that they've heard a little about it.

Pope Francis will be in Philadelphia Sept. 26 and 27 at the conclusion of the World Meeting of Families. He's also slated to make stops in Washington, D.C., and New York City.

Among Catholics, however, many more people reported knowing about the papal visit: 69 percent have heard a lot or little about it, and just 31 percent said they had heard nothing at all.

Among other findings from the survey:

- Sixty-seven percent of Americans have a favorable opinion of Pope Francis, while 56 percent hold a favorable view of the Catholic church.

- Ninety percent of Catholics view the pope favorably.

- A majority of Catholics say their views of the church have changed during Francis' papacy, with 59 percent of those saying their feelings have become more favorable.

- Fifty percent of Catholics said they agreed with Pope Francis' views on immigration, a topic the pontiff is expected to speak about at Independence Mall.