9071
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 17
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 9312
- Proper Divisor Sum (Aliquot Sum)
- 241
- 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
- 8832
- Möbius Function
- 1
- Radical
- 9071
- 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
- 91
- 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 of Twopins positions.at n=17A005683
- Least k such that first k terms of A022300 contain n more 2's than 1's.at n=10A025515
- a(n) = A026626(2*n-1, n-1).at n=7A026630
- a(n) = A026626(n, floor(n/2)).at n=15A026632
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 95.at n=4A031593
- (s(n)+1)/10, where s(n)=n-th base 10 palindrome that starts with 9.at n=29A043088
- Numbers having four 5's in base 6.at n=25A043392
- Sum{T(i,n-i): i=0,1,...,n}, array T as in A047089.at n=14A047090
- Number of incongruent ways to tile a 5 X 2n room with 1x2 Tatami mats. At most 3 Tatami mats may meet at a point.at n=37A068930
- Expansion of (1-x)/(1 + x^2 - x^3).at n=50A078031
- a(n) = Sum_{i=1..n} LookAndSay(i).at n=17A079664
- a(n) is the number of terms in the expansion of (x+y-z)*(x^2+y^2-z^2)*(x^3+y^3-z^3)*...*(x^n+y^n-z^n).at n=15A086817
- Odd terms of A059756.at n=5A111042
- Odd numbers n for which 17 is the smallest i (>= 1) with Jacobi symbol J(i,n) getting either a value 0 or -1.at n=9A112077
- a(n) = 324n - 1.at n=27A158306
- a(n) = 28*n^2 - 1.at n=17A158554
- Composite numbers such that exactly ten distinct permutations of digits are prime.at n=28A163562
- Totally multiplicative sequence with a(p) = a(p-1) + 5 for prime p.at n=46A166702
- Wiener index of the n-pan graph.at n=40A180861
- a(n) = 7*6^n-1.at n=4A198795