Hex #129192 or rgb(18,145,146) in RGB space is the tint of cyan. It has hue angle of 180.47 degrees, value = 57 and saturation = 88. #129192 can be obtained by mixing 4 colors: 1 drop of magenta, 5 drops of blue, 4 drops of cyan, 4 drops of green.
Nearest safe hex - #009999. Below you can see the block with #129192 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #129192 to the mixer and play with it.