11191
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 13
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 12192
- Proper Divisor Sum (Aliquot Sum)
- 1001
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 10260
- Möbius Function
- 0
- Radical
- 589
- Omega Function (Ω)
- 3
- 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
- 130
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- 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 7 positive 7th powers.at n=32A003374
- Number of inequivalent ways to color vertices of a regular tetrahedron using <= n colors.at n=19A006008
- a(n) = b(n) - c(n) where b(n) = [ (3/2)^n ] and c(n) is the n-th number not in sequence b.at n=22A014250
- a(n) = (2*n - 7)*n^2.at n=19A015242
- Pseudoprimes to base 69.at n=35A020197
- (d(n)-r(n))/5, where d = A026046 and r is the periodic sequence with fundamental period (1,0,4,0,0).at n=51A026048
- Numbers with multiplicative digital root value 9.at n=22A034056
- Numbers having four 1's in base 10.at n=20A043496
- The first n digits of the juxtaposition of the base-6 numbers converted to decimal.at n=5A055147
- a(n) = (2*n - 1)*(3*n^2 - 3*n + 2)/2.at n=15A063491
- a(n) is the number of pairs of integer quadruples (b_1, b_2, b_3, b_4) and (c_1, c_2, c_3, c_4) satisfying 1 <= b_1 < b_2 < b_3 < b_4 < n, 1 <= c_1 < c_2 < c_3 < c_4 < n, b_i != c_j for all i,j = 1,2,3,4 and Product_{i=1..4} sin(2*Pi*b_i/n) = Product_{i=1..4} sin(2*Pi*c_i/n).at n=50A063781
- Multiples of 19 containing a 19 in their decimal representation.at n=17A121039
- Numbers of the form 12n+7 for which Sum_{i=0..(4n+2)} J(i,12n+7) = 0, where J(i,m) is the Jacobi symbol.at n=35A165463
- Totally multiplicative sequence with a(p) = 6p+1 for prime p.at n=44A166664
- a(n) = n^2 + 731*n + 1.at n=15A180919
- Triangular array: the fission of (p(n,x)) by ((2x+1)^n), where p(n,x)=(x+1)^n.at n=34A193856
- Mirror of the triangle A193856.at n=29A193857
- Composite numbers whose multiplicative digital root is 9.at n=16A201024
- Number of isomorphism classes of reduced Witt rings of fields with 2n orderings.at n=20A213331
- Number of isomorphism classes of reduced Witt rings of fields with n orderings.at n=41A213332