12543
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 15
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 17328
- Proper Divisor Sum (Aliquot Sum)
- 4785
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 8064
- Möbius Function
- -1
- Radical
- 12543
- Omega Function (Ω)
- 3
- Little Omega Function (ω)
- 3
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
- 112
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- 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
- Fibonacci sequence beginning 0, 3.at n=19A022086
- Positive numbers k such that k and 3*k are anagrams in base 6 (written in base 6).at n=9A023065
- Decimal representation of permutations of lengths 1, 2, 3, ... arranged lexicographically.at n=38A030299
- Truncated triangular pyramid numbers: a(n) = (n-5)*(n^2 + 8*n - 66)/6.at n=36A051939
- Numbers k such that k^2 contains exactly 9 different digits.at n=7A054037
- Integers n > 10563 such that the 'Reverse and Add!' trajectory of n joins the trajectory of 10563.at n=1A063064
- Numbers whose square is a zeroless pandigital number (i.e., use the digits 1 through 9 once).at n=2A071519
- Numbers k that have no zero digits and such that both k+1 and (product of digits of k) + 1 are squares.at n=13A081990
- Quotient of LCM of prime(n+1)-1 and prime(n)-1 and GCD of the same two numbers.at n=47A083555
- Markoff numbers (A002559) multiplied by 3.at n=16A086326
- Smallest n-digit number k such that k+1 as well as 1 + the product of digits of k are squares greater than 1.at n=4A089697
- a(0) = 1; for n>0, a(n) = 3*Fibonacci(n).at n=19A097135
- Expansion of g.f. (7+6*x-6*x^2-3*x^3)/((x^2+x-1)*(x^2-x-1)).at n=17A099255
- a(n) = a(n-1) XOR (a(n-1) + a(n-2)), with a(1)=1, a(2)=3, where XOR is the binary exclusive OR operation.at n=13A099810
- Numbers with 5 distinct digits {1,2,3,4,5} such that all adjacent digits (as well as first and last digits) are coprime.at n=3A104972
- Numbers whose square is a permutational number A134640.at n=36A134742
- a(n) = 16n^2 + 32n + 15.at n=27A141759
- A sequence of asymptotic density zeta(9) - 1, where zeta is the Riemann zeta function.at n=24A143035
- a(n) = 392*n - 1.at n=31A158004
- a(n) = 784*n - 1.at n=15A158399