How to access VNC server running in an android phone in another computer?

I have installed Ubuntu in my Android phone and I can access its GUI in my phone by connecting a VNC viewer to localhost:1. The VNC server is running inside Android. Is it possible to access this in a computer connected to the wifi hotspot of the phone? I connected to computer to the phone's hotspot and tried to access locahost:1 in Real VNC Viewer, but it says "The connection was refused by the remote computer". Please note that I am **not** trying to access vnc server running in another computer in my phone but the opposite.