9557
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 26
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 5
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 10080
- Proper Divisor Sum (Aliquot Sum)
- 523
- 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
- 9036
- Möbius Function
- 1
- Radical
- 9557
- 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
- 29
- 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
- Positions of remoteness 3 in Beans-Don't-Talk.at n=35A005695
- Numbers k such that the continued fraction for sqrt(k) has period 74.at n=32A020413
- Numbers having period-2 6-digitized sequences.at n=33A031357
- Numbers whose base-2 representation has exactly 13 runs.at n=1A043580
- 5-morphic but not bimorphic, automorphic nor trimorphic.at n=45A056036
- a(n) = 2*a(n-1) - (-1)^n for n > 0, a(0)=2.at n=12A062092
- Numbers k such that A081252(m)/m^2 has a local minimum for m = k.at n=12A081253
- Expansion of (1+x-x^2)/((1-x)*(1-4*x^2)).at n=13A097163
- Number of partitions of the n-th abundant number into abundant numbers.at n=54A097800
- Array read by antidiagonals. Rows contain odd numbers reaching same odd successor in Collatz function iteration.at n=39A099730
- a(n) = 1 + 2 * least i such that A103509(i)=n+1, 0 if no such i exists.at n=34A103510
- Sums of antidiagonals of number array A103209.at n=7A107703
- Let b(0)=1/2, b(n) = b(n-1) + Prime[n]/2; a(n)=b(2*n).at n=44A112039
- Numbers of unstrained alkane staggered conformers (acyclic). See Table 4 of Cyvin et al. reference for precise definition.at n=6A126929
- A007318^(-1) * A133648.at n=12A133649
- a(n) = a(n-1) + 4a(n-2) - 4a(n-3).at n=13A136326
- A144325(n) + A144313(n) + A144315(n).at n=22A144715
- Array T(n,k) of odd Collatz preimages read by antidiagonals.at n=33A178415
- Number of (n+1)X(n+1) 0..3 arrays with each element of every 2X2 subblock being the sum mod 4 of two others.at n=2A183846
- Number of (n+1)X4 0..3 arrays with each element of every 2X2 subblock being the sum mod 4 of two others.at n=2A183848