831
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 12
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 1112
- Proper Divisor Sum (Aliquot Sum)
- 281
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 552
- Möbius Function
- 1
- Radical
- 831
- Omega Function (Ω)
- 2
- Little Omega Function (ω)
- 2
Special
- Factorial
- no
- Catalan Number
- no
- Bell Number
- no
- Motzkin Number
- no
- Primorial
- no
Figurate Numbers
- Fibonacci Number
- no
- Triangular Number
- no
- Perfect Square
- no
- Perfect Cube
- no
- Pentagonal Number
- no
- Hexagonal Number
- no
- Lucas Number
- no
- Tetrahedral Number
- no
- Pell Number
- no
- Tribonacci Number
- no
- Pronic Number
- no
Recreational
- Happy Number
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 134
- Smith Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- yes
- Squarefree Number
- yes
- Prime Power
- no
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Names
- German
- achthunderteinunddreißig· ordinal: achthunderteinunddreißigste
- English
- eight hundred thirty-one· ordinal: eight hundred thirty-first
- Spanish
- ochocientos treinta y uno· ordinal: 831º
- French
- huit cent trente et un· ordinal: huit cent trente et unième
- Italian
- ottocentotrentuno· ordinal: 831º
- Latin
- octingenti triginta unus· ordinal: 831.
- Portuguese
- oitocentos e trinta e um· ordinal: 831º
Appears in sequences
- Number of bipartite partitions of n white objects and 4 black ones.at n=8A000465
- Double-bitters: only even length runs in binary expansion.at n=23A001196
- Number of partitions of n into at most 5 parts.at n=32A001401
- Squares written in base 9.at n=25A002442
- Number of bipartite partitions of n white objects and 8 black ones.at n=4A002757
- Numbers that are the sum of 12 positive 5th powers.at n=39A003357
- Number of fractions in Farey series of order n.at n=52A005728
- Number of rooted toroidal maps with 2 faces and n vertices and without separating cycles or isthmuses.at n=3A006422
- Number of rooted toroidal maps with 4 faces and n vertices and without separating cycles or isthmuses.at n=1A006424
- Numbers k such that phi(k) = phi(sigma(k)).at n=34A006872
- Number of simplicial 3-clusters with n cells.at n=7A007173
- Number of Havender tableaux of height 2 with n columns.at n=4A007345
- Expansion of (x^6-x^5-x^4+2x^2)/((1-x^3)(1-x^2)^2(1-x)).at n=34A007988
- Coordination sequence T1 for Zeolite Code AEL.at n=19A008004
- Coordination sequence T1 for Zeolite Code MTW.at n=19A008196
- Coordination sequence T6 for Zeolite Code DFO.at n=22A009880
- Apply partial sum operator twice to binary rooted tree numbers.at n=10A014168
- a(n) = Sum_{k=1..n-1} ceiling(k^2/n).at n=49A014811
- Number of 5-tuples of different integers from [ 1,n ] with no common factors among pairs.at n=18A015698
- Coordination sequence T1 for Zeolite Code CGF.at n=20A019451