Including the 2 numbers you listed, 25,000
Not including the 2 numbers you listed, 24,998
Only one. 123456.
1089
An infinite amount
1089 palindromes
100000
Only one. 123456.
There is only one number and that is 123456.
theres only 1 number which is 123456, the least digit is 1 and the greatest is 6
1089
An infinite amount
There are 449999 such numbers.
There are 90,000 such numbers.
100.
There are 9592 primes.
1089 palindromes
There are 89,999 numbers between 100,000 and 999,999 that are divisible by 10.
every other number between 100 and 100000 can be divided by 3. therefore there are 100000-100= 99900 numbers between 100 and 100000. and 99900/2= 49950 numbers that can be divided by two between those two (i'm not sure if that includes the endpoints, you'll have to give some serious thought to that one)