2291
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 14
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 2400
- Proper Divisor Sum (Aliquot Sum)
- 109
- 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
- 2184
- Möbius Function
- 1
- Radical
- 2291
- 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
- 151
- Smith Number
- no
- Vampire 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
Appears in sequences
- Numbers that are the sum of 3 positive 5th powers.at n=18A003348
- G.f.: 1/((1-x)*(1-x^2)*(1-x^3)^2*(1-x^4)*(1-x^5)).at n=31A003402
- Numbers that are the sum of at most 3 positive 5th powers.at n=33A004843
- Number of elements in Z[ sqrt(-2) ] whose 'smallest algorithm' is <= n.at n=15A006459
- Coordination sequence T2 for Zeolite Code RSN.at n=31A009886
- Coordination sequence T1 for Zeolite Code CZP.at n=31A019456
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly seven 1's.at n=11A020443
- Index of 10^n within the sequence of the numbers of the form 3^i*10^j.at n=46A025741
- Number of partitions of n into distinct parts, the greatest being odd.at n=51A026837
- Number of partitions of n into distinct parts, the greatest being even.at n=51A026838
- Number of partitions of n into an odd number of parts.at n=29A027193
- Integer part of decimal 'base-2 looking' numbers divided by their actual base-2 values (denominator of a(n) is n, numerator is n written in binary but read in decimal).at n=47A032532
- a(n+1) = a(n) + sum of squares of digits of a(n).at n=35A033936
- Multiplicity of highest weight (or singular) vectors associated with character chi_178 of Monster module.at n=37A034566
- Number of partitions of n such that cn(0,5) = cn(2,5) < cn(1,5) < cn(3,5) = cn(4,5).at n=64A036860
- Coordination sequence T2 for Zeolite Code STF.at n=32A038441
- Denominators of continued fraction convergents to sqrt(368).at n=4A041697
- Denominators of continued fraction convergents to sqrt(969).at n=10A042875
- Numbers k such that string 6,3 occurs in the base 8 representation of k but not of k-1.at n=39A044238
- Numbers k such that the string 2,5 occurs in the base 9 representation of k but not of k-1.at n=31A044274