8071
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 16
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 9232
- Proper Divisor Sum (Aliquot Sum)
- 1161
- 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
- 6912
- Möbius Function
- 1
- Radical
- 8071
- 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
- 70
- 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
- no
- Odd
- yes
Appears in sequences
- Number of connected graphs with n edges.at n=11A002905
- Number of connected line graphs with n nodes.at n=10A003089
- Total preorders.at n=7A006328
- Numbers k such that the continued fraction for sqrt(k) has period 56.at n=41A020395
- 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 89.at n=13A031587
- Numbers k such that k-th and (k+1)-st term of A038593 differ by 4.at n=8A038635
- Numbers ending with '1' that are the difference of two positive cubes.at n=32A038856
- (s(n)+2)/10, where s(n)=n-th base 10 palindrome that starts with 8.at n=29A043087
- a(1) = 9; a(n) is smallest number >= a(n-1) such that the juxtaposition a(1)a(2)...a(n) is a prime.at n=44A046259
- Triangle T(n,k) read by rows; related to number of preorders.at n=47A079502
- a(n) = n^3 + prime(n).at n=19A089620
- The Shift-Moebius transform of powers of 2.at n=13A117177
- Number of compositions of n such that the number of parts is divisible by the smallest part.at n=13A171625
- Triangle of coefficients of polynomials u(n,x) jointly generated with A210804; see the Formula section.at n=51A210803
- Number of (w,x,y) with all terms in {0,...,n} and |w-x| + |x-y| + |y-w| >= w + x + y.at n=29A213489
- Odd composite numbers n, such that n, n+d, n*d and n/d are all odious (A000069) for every divisor d of n.at n=17A231558
- Odd numbers which are factored to the same set of primes in Z as to the irreducible polynomials in GF(2)[X]; odd terms of A235036.at n=21A235039
- a(n) = 2^(n+1) - (n-1)^2.at n=12A243860
- Triangle read by rows: T(n,k) = number of graphs with n edges and k connected components.at n=55A275421
- p-INVERT of A014217 (starting at n=1), where p(S) = 1 - S - S^2.at n=7A289927