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-UE
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{{Example farm|date=March 2010}}
{| class="infobox" style="width: 20em;"
|-
! colspan="2" align="center" style="font: 10em verdana; background:#ccc;" | 5
|-
| colspan="2" | {{numbers (digits)}}
|-
| Cardinal
| 5
five
|-
| Ordinal
| 5th
fifth
|-
| Numeral system
| quinary
|- (5)
| Factorization
| prime
|-
| Divisors
| 1, 5
|-
| Roman numeral
| V
|-
| Roman numeral (Unicode)
| Ⅴ, ⅴ
|-
| Greek numeral
| ε΄
|-
| Arabic || ٥,5
|-
| Arabic (Persian, Urdu) || ۵
|-
| Ge'ez || ፭
|-
| Bengali || ৫
|-
| Punjabi || ৫
|-
| Chinese numeral || 五，伍
|- (5)
| Devanāgarī || ५
|-
| Hebrew || ה (He)
|-
| Khmer || ៥
|-
| Malayalam || ൫
|-
| Tamil || ௫
|-
| Thai || ๕
|-
| prefixes
| penta-/pent- (from Greek)
quinque-/quinqu-/quint- (from Latin)
|-
| Binary
| 101
|-
| Octal
| 5
|-
| Duodecimal
| 5
|-
| Hexadecimal
| 5
|-
| Vigesimal
| 5 (5)
|}
'''5''' ('''five''') is a number, numeral, and glyph. It is the natural number following 4 and preceding 6.
==In mathematics==
Five is the third prime number. Because it can be written as
221+1, five is classified as a Fermat prime. 5 is the third Sophie Germain prime, the first safe prime, the third Catalan number, and the third Mersenne prime exponent. Five is the first Wilson prime and the third factorial prime, also an alternating factorial. Five is the first good prime. It is an Eisenstein prime with no imaginary part and real part of the form . It is also the only number that is part of more than one pair of twin primes. Five is a congruent number.
Five is conjectured to be the only odd untouchable number and if this is the case then five will be the only odd prime number that is not the base of an aliquot tree.
The number 5 is the 5th Fibonacci number, being 2 plus 3. 5 is also a Pell number and a Markov number, appearing in solutions to the Markov Diophantine equation: (1, 2, 5), (1, 5, 13), (2, 5, 29), (5, 13, 194), (5, 29, 433), ... ({{OEIS2C|id=A030452}} lists Markov numbers that appear in solutions where one of the other two terms is 5). Whereas 5 is unique in the Fibonacci sequence, in the Perrin sequence 5 is both the fifth and sixth Perrin numbers.
In bases 10 and 20, 5 is a 1-automorphic number.
5 and 6 form a Ruth–Aaron pair under either definition. The classification however may be frowned upon.
There are five solutions to Znám's problem of length 6.
Five is the second Sierpinski number of the first kind, and can be written as S2=(22)+1
While polynomial equations of degree 4 and below can be solved with radicals, equations of degree 5 and higher cannot generally be so solved. This is the Abel–Ruffini theorem. This is related to the fact that the symmetric group ''S''''n'' is a solvable group for ''n'' ≤ 4 and not solvable for ''n'' ≥ 5.
and if I mess up you will snipe me for it, I declare you failed.