31

Basic Information

Cardinal Number

thirty-one

Ordinal Number

thirty first

Roman Numeral

XXXI

Greek Numeral

ΛΑ´

Factorization

31

Different Representations

Binary Form

11111₂

Ternary Form

1011₃

Quaternary Form

133₄

Quinary Form

111₅

Senary Form

51₆

Septenary Form

43₇

Octal Form

37₈

Nonary Form

34₉

Undecimal Form

29₁₁

Duodecimal Form

27₁₂

Tridecimal Form

25₁₃

Quattuordecimal Form

23₁₄

Quindecimal Form

21₁₅

Hexadecimal Form

1F₁₆

Septendecimal Form

1E₁₇

Octodecimal Form

1D₁₈

Novemdecimal Form

1C₁₉

Vigesimal Form

1B₂₀

Unvigesimal Form

1A₂₁

Duovigesimal Form

19₂₂

Trevigesimal Form

18₂₃

Quattuorvigesimal Form

17₂₄

Quinvigesimal Form

16₂₅

Hexavigesimal Form

15₂₆

Septenvigesimal Form

14₂₇

Octovigesimal Form

13₂₈

Novemvigesimal Form

12₂₉

Trigesimal Form

11₃₀

Untrigesimal Form

10₃₁

Duotrigesimal Form

V₃₂

Tretrigesimal Form

V₃₃

Quattuortrigesimal Form

V₃₄

Quintrigesimal Form

V₃₅

Hexatrigesimal Form

V₃₆

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[[29]]	31	[[37]]

31 is a prime number from 1-100. 31 has 2 factors, 1 and 31. It is said to be a number wherein when digits are added together, they make a composite number. It is the eleventh prime number, and the eleventh prime number from 1-100.

Proofs

1 can divide 31
2 cannot
3 cannot
4 - 28 cannot
29 cannot
30 also cannot
31 can divide 31