-14
43, 47, 53, 59, and 61; plus 41 and 67 if you are including them, as well.
It is 73, 47 over 61.
There are listed two prime numbers, 47 and 61. 112 is not a prime number since it is an even number and can be divided by 2.
61 neutrons 47 protons and 47 neutrons
108 - 47 = 61 neutrons 47 = atomic number of silver = number of protons
47 protons, 47 electrons and 61 neutrons
That appears to be a number in Townsville, Queensland, Australia, country code +61.
-61
As silver atoms have 47 protons, the given isotope has 61 neutrons.
16 + 12 + 47 = 75
47 plus 39 gives 86.