Hex #718197 or rgb(113,129,151) in RGB space is the tint of blue. It has hue angle of 214.74 degrees, value = 59 and saturation = 25. #718197 can be obtained by mixing 3 colors: 2 drops of blue, 4 drops of white, 3 drops of black.
Nearest safe hex - #669999. Below you can see the block with #718197 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #718197 to the mixer and play with it.