Hex #5b81a4 or rgb(91,129,164) in RGB space is the tint of blue. It has hue angle of 208.77 degrees, value = 64 and saturation = 45. #5b81a4 can be obtained by mixing 4 colors: 5 drops of magenta, 1 drop of blue, 5 drops of cyan, 3 drops of green.
Nearest safe hex - #669999. Below you can see the block with #5b81a4 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #5b81a4 to the mixer and play with it.