Number 19, what do you know about it?

Question

what do you know about number 19?

Answer 1

http://en.wikipedia.org/wiki/Number_19

Answer 2

I've found a lot of things about number 19

In mathematics

19 is a centered triangular number, centered hexagonal number, and an octahedral number.
19 is the fourth alternating factorial, as it is equal to −(1!) + 2! + −(3!) + 4!
With respect to divisibility, nineteen has a very simple test: 19 divides 100a + b if and only if it divides a + 4b.
In Roman numerals, however, 19 is the largest palindromic prime.

In science

19 is atomic number of potassium.
19 is an essential number in quantum physics.

In religion

The number of years in each cycle of the intercalated Hebrew calendar, in which 7 of the 19 years are leap years
The number of angels guarding Hell according to the Qur'an: "Over it is nineteen" (74:30)

Nineteen also is

The nineteenth state to enter the Union was Indiana

Part of the name of a breakfast cereal: Product 19

The Soviet submarine K-19 was the first Soviet nuclear ballistic submarine

I-19 is the designation for a US interstate highway in Arizona

Answer 3

Nineteen is the 8th smallest prime number. The sequence continues 23, 29, 31, 37... 19 is the seventh Mersenne prime exponent.

Every positive integer is the sum of at most nineteen fourth powers (see Waring's problem).

Nineteen is a centered triangular number, centered hexagonal number, and an octahedral number.

Nineteen is a Heegner number.

19 is the fourth alternating factorial, as it is equal to −(1!) + 2! + −(3!) + 4!

With respect to divisibility, nineteen has a very simple test: 19 divides 100a + b if and only if it divides a + 4b.

In base 10, it is a Keith number, because it recurs in a Fibonacci-like sequence started from its base 10 digits: 1, 9, 10, 19... The decimal expansion of 1/19 has a period of maximum length: 18 digits. Regardless of the base, 19 is a strictly non-palindromic number. In Roman numerals, however, 19 is the largest palindromic prime.

Answer 4

its an odd number, about 19 places away from zero on the number line. Wedged right there between 18 and 20. Has the numbers 1 and 9 within it.

Answer 5

i am 19 next year

Answer 6

inbetween 18 and 20

Answer 7

that it comes 7 after 12

Answer 8

It's a prime number.
It comes after 18 and precedes 20.

That's about it.

Answer 9

Usually found between "18" and "20", at least that's what I was taught.

Answer 10

Nothing.