9182
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 20
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 13776
- Proper Divisor Sum (Aliquot Sum)
- 4594
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 4590
- Möbius Function
- 1
- Radical
- 9182
- 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
- 171
- 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
- yes
- Odd
- no
Appears in sequences
- Convolution of Lucas numbers and composite numbers.at n=12A023618
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 94.at n=28A031592
- (s(n)+1)/10, where s(n)=n-th base 10 palindrome that starts with 9.at n=40A043088
- Becomes prime or 4 after exactly 8 iterations of f(x) = sum of prime factors of x.at n=36A048130
- Numbers k such that k and 8*k, taken together, are zeroless pandigital.at n=37A115932
- Number of ways to build a contiguous building with n LEGO blocks of size 1 X 4 on top of a fixed block of the same size so that the building is symmetric after a rotation by 180 degrees.at n=5A123783
- Numbers n such that n^2 + 2*(n+2)^2 is a square.at n=3A174592
- Inverse permutation to A190134.at n=12A190135
- a(n) = [x^n] Product_{k=1..n} (1 + x^k)^(n-k+1).at n=8A206229
- Number T(n,k) of multisets of nonempty words with a total of n letters over k-ary alphabet such that all k letters occur at least once in the multiset; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=25A257740
- Numbers k such that sigma_0(k-1) + sigma_0(k) + sigma_0(k+1) = 10, where sigma_0(k) = A000005(k).at n=48A317670
- Number of multisets of nonempty words with a total of n letters over quaternary alphabet such that all letters occur at least once in the multiset.at n=2A320214
- Root of the upper member A340701 of a pair of adjacent perfect powers, both with exponents > 2.at n=50A340703
- Semiprimes that are the sum of two successive semiprimes and also the sum of three successive semiprimes.at n=24A370162
- Number of weak compositions of n such that the set of adjacent differences is a subset of {-1,1}.at n=20A383620