It is 127
127 + 47 = 174 174 - 47 = 127
127.
It will be quicker to try different powers of two, and seeing if the remainder is prime. 127 = 1 + 126, 126 isn't prime 127 = 2 + 125, 125 isn't prime 127 = 4 + 123, 123 isn't prime 127 = 8 + 119, 119 isn't prime 127 = 16 + 111, 111 isn't prime 127 = 32 + 95, 95 isn't prime 127 = 64 + 63, 63 isn't prime 127 < 128, so all the possibilities are exhausted. So, 127 can't be expressed as a sum of a prime and a power of two.
121 123 125 127
No. 127 is not a composite number because it is only divisible by 1 and 127
127 is prime.
127 and 1
1 times 127 = 127 which is a prime number
127 is evenly divisible by '1' and '127'.
127
There is no isotope with the atomic number 75. Iodine has two stable isotopes: iodine-127 and iodine-129.
127 is an integer, and as a decimal number, it is 127.