16731
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 18
- Divisor Sum
- 28548
- Proper Divisor Sum (Aliquot Sum)
- 11817
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 9360
- Möbius Function
- 0
- Radical
- 429
- Omega Function (Ω)
- 5
- 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
- 66
- 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) = 6*a(n-1) - a(n-2) - 2 with a(0) = 1, a(1) = 3.at n=6A011900
- a(n) = (n+1)*binomial(n+1,5).at n=8A027765
- a(n) = (n+1)*binomial(n+1,8).at n=5A027768
- Distinct numbers in writing first numerator and then denominator of each element of the 1/5-Pascal triangle (by row).at n=54A046608
- First numerator and then denominator of the elements to the right of the central elements of the 1/5-Pascal triangle (by row), excluding 1's and 5's.at n=42A046616
- Numerators of the elements to the right of the central elements of the 1/5-Pascal triangle (by row).at n=56A046618
- Distinct odd numbers in the numerators of the 1/5-Pascal triangle (by row).at n=27A046624
- Distinct numbers in writing first numerator and then denominator of each element to the right of the central elements of the 1/5-Pascal triangle (by row).at n=44A046627
- Distinct odd numbers in writing first numerator and then denominator of each element to the right of the central elements of the 1/5-Pascal triangle (by row).at n=26A046628
- Partial sums of A051879.at n=8A050405
- Partial sums of A051947.at n=8A050483
- Numbers n such that 283*2^n-1 is prime.at n=7A050900
- Pseudo-random numbers: Davenport's generator for 32-bit integers.at n=25A084277
- Group the natural numbers >= 1 so that the n-th group contains n(n+1)/2 numbers and obtain the group sum.at n=10A095166
- Ninth column (m=8) of (1,4)-Pascal triangle A095666.at n=7A095671
- Integers k such that 10^k+49 is prime.at n=27A108054
- Expansion of (1-3*x) / (1-5*x-5*x^2+x^3).at n=6A108475
- Expansion of 1/sqrt(1 -2*x -3*x^2 -4*x^3 +4*x^4).at n=10A108488
- a(2n) = A011900(n), a(2n+1) = A001109(n+1).at n=12A113225
- Expansion of (1-x)/((1-x)^2 - x^2*(1+x)^2).at n=12A116404