Hex #3981a1 or rgb(57,129,161) in RGB space is the tint of bluish cian. It has hue angle of 198.46 degrees, value = 63 and saturation = 65. #3981a1 can be obtained by mixing 4 colors: 5 drops of blue, 4 drops of cyan, 4 drops of white, 5 drops of black.
Nearest safe hex - #339999. Below you can see the block with #3981a1 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #3981a1 to the mixer and play with it.