Today is 5 day of the year.

5 is prime.

5 is a safe prime.

5 = 2 + 3, i.e. the sum of the first two primes.

5 is Fibonacci number.

5 is an untouchable number and conjectured to be the only odd one.

There are 5 platonic solids.

5 is the fourth Pell number.

The series of fractions formed by taking a Pell number as the denominator and the sum of the Pell number and its predecessor, gets arbitrarily close to the square root of two.

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