Yes
There are five of them, including the number 1.
There are exactly 5,761,455 prime numbers below 100,000,000, the first being two, and the last 99,999,989.
56 + 56 + 28 + 8 + 2 + 1 = 151
The number that is halfway between one and one half (1½) and one (1) is one and one quarter (1¼)
a prime number
Because the prime numbers between 1and 50 only have exactly 2 unique factors.
Yes
What number between 1and 10 can go into 1001
There are five of them, including the number 1.
(24+1)/2 = 12.5
Factors.
1 1 and 3
There are exactly 5,761,455 prime numbers below 100,000,000, the first being two, and the last 99,999,989.
56 + 56 + 28 + 8 + 2 + 1 = 151
Only common is one only
15 and 30 have those factors.