17485
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 25
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 22680
- Proper Divisor Sum (Aliquot Sum)
- 5195
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 12864
- Möbius Function
- -1
- Radical
- 17485
- 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
- 110
- 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
- Small 3-Schroeder numbers: a(n) = A027307(n+1)/2.at n=5A034015
- Numbers whose base-4 representation has exactly 8 runs.at n=7A043599
- Numbers n such that number of runs in the base 4 representation of n is congruent to 1 mod 7.at n=28A043844
- Numbers n such that number of runs in the base 4 representation of n is congruent to 0 mod 8.at n=7A043850
- Numbers n such that number of runs in the base 4 representation of n is congruent to 8 mod 9.at n=7A043866
- Numbers k such that number of runs in the base 4 representation of k is congruent to 8 mod 10.at n=7A043875
- Numbers n such that 105*2^n-1 is prime.at n=34A050578
- Downward vertical of triangular spiral in A051682.at n=31A081272
- Length of list created by n substitutions k -> Range( -abs(k+1), abs(k-1), 2) starting with {1}.at n=10A084075
- Triangle read by rows: T(n,k) is number of paths from (0,0) to (3n,0) that stay in the first quadrant (but may touch the horizontal axis), consisting of steps u=(2,1), U=(1,2), or d=(1,-1) and having k u=(2,1) steps among the steps leading to the first d step.at n=21A108440
- a(n) gives one fourth of the even leg of one of the two Pythagorean triangles with hypotenuse A080109(n) = A002144(n)^2. The odd leg is given in A253802(n).at n=25A253803
- Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 601", based on the 5-celled von Neumann neighborhood.at n=25A272824
- Composite numbers whose sum of aliquot parts divide the sum of the squares of their aliquot parts.at n=36A301482
- Number of compositions (ordered partitions) of n into Jacobsthal numbers 1,3,5,11,21,43, ... (A001045).at n=23A357519
- G.f. satisfies A(x) = 1 + x*A(x) / (1 - x^5*A(x)^3).at n=18A365735
- Centered square numbers which are sphenic numbers.at n=8A380882