Why doesn't mkfifo with a mode of 1755 grant read permissions and sticky bit to the user?

I'm creating a server and client situation where i want to create a pipe so they can communicate. I created the pipe in the server code with mkfifo("fifo",1755);: - 1 for only user that created and root to be able to delete it or rename it, - 7 for give read, write and exec to user, and - 5 for both group and other to only give them read and exec. The problem is that later in the server code I open the fifo to read from it

("fifo",O_RDONLY);

but when i execute it, it shows me an perror that denies me acess to the fifo. I went to see the permissions of the pipe fifo and it says p-wx--s--t so: - p stands for pipe, - - means the user has no read. I don't know how when I gave it with the 7, - s group executes has user. I don't how if i gave 1 so supposedly it should give to user and others the ability to only read and execute and others have t that was expected. Do I have a misunderstanding of the permissions?