How many number one singles does Katy Perry have on the US Billboard Hot 100?
9
2
1
2
3
1
2
3
1
2
3
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
5
4
1
2
3
5
4
1
2
3
5
4
1
2
3
5
4
1
2
3
5
4
1
2
3
5
4
1
2
3
5
4
1
2
3
5
4
1
2
3
5
4
1
2
3
5
4
1
2
3
5
6
4
1
2
3
5
6
4
1
2
3
5
6
4
1
7
3
5
6
4
7
5
6
4
7
5
6
4
7
5
6
4
7
5
6
7
5
6
7
8
5
6
7
9
8
6
7
9
8
6
7
9
8
11
6
7
10
9
8
11
6
7
10
9
8
11
6
7
10
9
8
11
6
7
10
9
8
11
6
7
10
9
8
11
6
12
7
10
9
8
11
6
12
7
10
13
9
8
11
6
12
7
10
13
9
8
11
12
7
10
13
9
8
11
12
7
128
128
128
5 Songs
128
175
4 Songs
3 Songs