7 digits.
We only use 10 digits (0 through 9), so I would say, there is one of them.
100230, which includes the first one to the left of the decimal point.
7.
6
One million is 1 followed by 6 zeroes - a total of 7 digits.
None, since pie is not a number. However, there are 100230 threes in the first 1 million digits of pi.
There are 6 zeros in one million written in digits (1,000,000).
They are listed on the Related Link.
The record passed one million digits in 1999, earning a $50,000 prize. In 2008 the record passed ten million digits, earning a $100,000 prize and a Cooperative Computing Award from the Electronic Frontier Foundation. Additional prizes are being offered for the first prime number found with at least one hundred million digits and the first with at least one billion digits. The current record as of 2013 is over 17 million digits.
There are seven digits.
One of them.