Its complementary color is cyan in the CMYK and RGB color models.
It is also a complimentary color to cyan which is surprising to me.
Red is an awesome color. Nice. It's next to orange on the spectrum of visible light. Oh yea? I love both those colors. Great! Red's dominant wavelength is around 625-740 nanometers. thats cool.
It is a primary color in the RGB color model and the CMYK color model, and is the complementary color of cyan.