17631
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
- 8
- Divisor Sum
- 26160
- Proper Divisor Sum (Aliquot Sum)
- 8529
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 11736
- Möbius Function
- 0
- Radical
- 1959
- Omega Function (Ω)
- 4
- 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
- 53
- 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+1) = Sum_{k=0..floor(n/3)} a(k) * a(n-k).at n=18A030032
- Numerators of continued fraction convergents to sqrt(98).at n=6A041176
- Numerators of continued fraction convergents to sqrt(338).at n=6A041638
- Generalized Pellian with second term equal to 7.at n=10A048694
- Numerators of coefficients in series expansion of -512*(1+x)^3/(x-8)^3.at n=11A066414
- Numbers k such that the decimal digits of phi(k) are a permutation of those of k.at n=21A115921
- a(n) = 6*a(n-1) - a(n-2) for n > 1; a(0) = 1, a(1) = 15.at n=5A164541
- Numbers n such that (ceiling(sqrt(n*n/2)))^2 - n*n/2 = 17/2.at n=9A175033
- Irregular triangle read by rows: T(n,k) = number of crossing connected diagrams in a disk having n crossings and k vertices.at n=30A232225
- a(0)=1, a(1)=4; thereafter a(n) = a(n-2)+2*A055099(n-1)+2^(n-1).at n=8A256960
- Products of three distinct tribonacci numbers > 1.at n=36A274434
- Number of points of norm <= n in the bi-truncated cubic honeycomb (3-dimensional lattice, with truncated-octahedral cells).at n=16A276450
- Numbers k such that A307437(k) is divisible by 3.at n=31A342037