9559
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 28
- Digital Root
- 1
- Palindromic Number
- yes
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 10640
- Proper Divisor Sum (Aliquot Sum)
- 1081
- 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
- 8580
- Möbius Function
- 0
- Radical
- 869
- 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
- 78
- 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
- a(n) = T(n,n-3), where T is the array in A026148.at n=8A026154
- a(n) = (2*n - 1)*(3*n + 1).at n=40A033569
- Partial sums of primes congruent to 1 mod 6.at n=42A038349
- Palindromes that start with 9.at n=17A043044
- Largest palindromic substring in 8^n.at n=46A046266
- Composite palindromes whose sum of prime factors is palindromic (counted with multiplicity).at n=16A046354
- Composite palindromes whose sum of prime factors is prime (counted with multiplicity).at n=33A046365
- Number of 3-connected rooted cubic planar maps with n faces and girth at least 4.at n=8A058861
- Numbers n such that phi(phi(n)) + sigma(sigma(n)) = phi(sigma(n)) + sigma(phi(n)), where phi=A000010 is Euler's totient function and sigma=A000203 is the sum of divisors function.at n=3A066850
- Largest palindrome using minimum number of digits with a digit sum = n.at n=28A070244
- Palindromic odd numbers with exactly 3 prime factors (counted with multiplicity).at n=30A075814
- Palindromic odd composite numbers with an odd number of prime factors (counted with multiplicity).at n=33A075815
- Numbers of the concatenated form 9nn9.at n=5A102484
- Numbers such that the outer 2 digits are 9 and the inner digits are 5.at n=1A108903
- a(n) = (10^k - n)(10^k + n), where k is the number of digits in n.at n=20A110397
- Palindromes whose ten's complements are squares.at n=10A121233
- Nonprimes in the triangle A141020.at n=25A141031
- Palindromes that are the sum of a positive square and a positive cube.at n=41A151952
- Transform of the finite sequence (1, 0, -1, 0, 1, 0, -1) by the T_{1,0} transformation (see link).at n=11A159338
- 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=28A165463