Mathematical models for predicting the post COVID-19 world population in 2039

Scientists believe that the world population will increase to 9.2 billion people. In this work, we present some mathematical models to predict the year when the world's population will reach 9.2 billion people after COVID-19. Next, the predict results of the models are investigated by the iterative method. We also find the four of these models predict that the year of 2039, the post COVID-19 world population will reach 9.2 billion. Finally, we illustrate the numerical results using some advantages of mathematical software to support the predict results of the models.