13235
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 14
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 15888
- Proper Divisor Sum (Aliquot Sum)
- 2653
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 10584
- Möbius Function
- 1
- Radical
- 13235
- 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
- 45
- 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 k such that the least term in the periodic part of the continued fraction for sqrt(k) is 23.at n=4A031701
- Numbers k such that 41*2^k+1 is prime.at n=10A032370
- Denominators of continued fraction convergents to sqrt(159).at n=14A041293
- Denominators of continued fraction convergents to sqrt(636).at n=8A042221
- Interprimes which are of the form s*prime, s=5.at n=30A075280
- Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1010-1111-1000 pattern in any orientation.at n=10A146643
- Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-1111-0010 pattern in any orientation.at n=10A146699
- a(n) = 529*n^2 + 2*n.at n=4A158367
- Coefficient of x in the reduction by x^2 -> x+1 of the polynomial p(n,x) defined at Comments.at n=15A192961
- Number of zero-sum -n..n arrays of 4 elements with first and second differences also in -n..n.at n=22A201875
- Number of (n+4) X 11 0..1 matrices with each 5 X 5 subblock idempotent.at n=11A224689
- Numbers such that Liouville's function (A002819) and the little omega analog to Liouville's function (A174863) are equal.at n=43A224987
- Coinage sequence: a(n) = A018227(n)-7.at n=39A272000
- Decimal representation of the diagonal from the corner to the origin of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 361", based on the 5-celled von Neumann neighborhood.at n=26A287788