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19 is a prime number from 1-100. 19 has 2 factors, 1 and 19. It is said to be the last number ranging from 1-100 that ends with teen, and after this number, by age you are already 20 years old, so you are not a teenager anymore. It is the eighth prime number, and the eighth prime number from 1-100.

## Proofs

• Therefore it has 2 factors

## As an Exponent of Mersenne Number

219 - 1, which is the number 524,287, is a prime number. It is the 7th Mersenne Prime.

## ​Relationship with other odd numbers

### The numbers before

• The previous odd number, 17, is a prime number.
• There are no odd numbers between 17 and 19. As a result, they are twin primes.
• The odd number previous to 17 is 15. 15 is not a prime number. It is divisible by 3 and 5.
• The odd number previous to 15 is 13. 13 is a prime number.
• 13 and 19 are six numbers apart; therefore, they are sexy primes.

### The numbers after

• The next odd number, 21, is not a prime number. It is divisible by 3 and 7.
• 23, the odd number following 21, is a prime number.
• 19 and 23 are four numbers apart; therefore, they are cousin primes.
• 25, the odd number following 23, is not a prime number. It is a square number, being 52 = 25.
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