Hex #509dba or rgb(80,157,186) in RGB space is the tint of bluish cian. It has hue angle of 196.42 degrees, value = 73 and saturation = 57. #509dba can be obtained by mixing 4 colors: 4 drops of blue, 4 drops of cyan, 5 drops of white, 3 drops of black.
Nearest safe hex - #6699cc. Below you can see the block with #509dba color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #509dba to the mixer and play with it.