16
Yes
There are five of them, including the number 1.
56 + 56 + 28 + 8 + 2 + 1 = 151
There are exactly 5,761,455 prime numbers below 100,000,000, the first being two, and the last 99,999,989.
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.
1 1 and 3
Factors.
56 + 56 + 28 + 8 + 2 + 1 = 151
There are exactly 5,761,455 prime numbers below 100,000,000, the first being two, and the last 99,999,989.
Only common is one only
15 and 30 have those factors.
The prime numbers: 2, 3, 5, 7, 11, 13, 17 and 19.