257,885,161 -1 as of 2013. New primes are being calculated all the time, so this will change as new and larger ones are discovered. Also, note that there are infinitely many primes (proved by Euclid around 300 BCE), so there won't ever be a single "highest" prime, only the highest one known.
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The largest known prime number was discovered in August 2008.It has about 12.9 million digits - so we won't be reproducing it here!It is one less than 2 raised to the 43112609th power:243112609_-1" Other primes have been found since then but they are smaller numbers.
September has 19 days that are prime numbers Note: 1 is not prime or composite
September has thirty days. Of the numbers 1-30, the following are prime: 2,3,5,7,11,13,17,19,23,29. The others are composite, except 1 which is neither! So, 10 primes, 19 composites, and 1
A liber number is issued by a public records authority on documents which it has recorded. Also known as "book and page number", it originally referred to the actual physical journal in which copies of public records were bound. As the volume of legal filings have grown over decades and centuries, many public records authorities have began storing documents in electronic format. The electronic copies are often journaled by the date on which they are filed, resulting in a "serial number" of sorts. Even though this number no longer results in a "book" and "page" number, the serial number for the recorded document is still known as the liber number.
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