Hex #154d79 or rgb(21,77,121) in RGB space is the tint of blue. It has hue angle of 206.40 degrees, value = 47 and saturation = 83. #154d79 can be obtained by mixing 4 colors: 1 drop of magenta, 3 drops of blue, 3 drops of cyan, 5 drops of black.
Nearest safe hex - #006666. Below you can see the block with #154d79 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #154d79 to the mixer and play with it.