12169
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 12496
- Proper Divisor Sum (Aliquot Sum)
- 327
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 11844
- Möbius Function
- 1
- Radical
- 12169
- 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
- 156
- 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
- a(0) = 1, a(n) = 23*n^2 + 2 for n>0.at n=23A010013
- Strong pseudoprimes to base 44.at n=13A020270
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 72 ones.at n=12A031840
- Number of compositions (ordered partitions) of n into distinct odd parts.at n=51A032021
- a(n) = (n-1)*(n-2)*(n-3) + n.at n=24A034324
- Third row of Pascal-(1,3,1) array A081578.at n=39A081585
- a(n) = n^3 + 2.at n=23A084380
- Semiprimes of the form 2*n + 1, where n is a square.at n=33A111351
- Products of two primes that are not Chen primes.at n=37A115719
- Numbers such that the sum of the factorials of the digits of the cube is a square.at n=33A126076
- a(n) = 18*n^2 + 1.at n=25A157889
- a(n) = 338*n + 1.at n=35A158000
- a(n) = 676*n + 1.at n=17A158386
- a(n) = 72*n^2 + 1.at n=13A158740
- Least number k such that the decimal representation of 1/k has period Fibonacci(n).at n=14A170945
- G.f.: [Sum_{n>=0} x^(n*(n+1)/2) * (1+x)^n ]^3.at n=33A182152
- Half the number of n X n X n triangular binary arrays with each element having no more than two neighbors unequal to itself.at n=11A183276
- Number of n X 5 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 1 and 1 1 0 vertically.at n=6A207302
- Number of 7Xn 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 1 and 1 1 0 vertically.at n=4A207310
- Number of (w,x,y) with all terms in {0,...,n} and max(w,x,y) >= 2*min(w,x,y).at n=24A213390