6534
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 24
- Divisor Sum
- 15960
- Proper Divisor Sum (Aliquot Sum)
- 9426
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 1980
- Möbius Function
- 0
- Radical
- 66
- Omega Function (Ω)
- 6
- 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
- yes
- Harshad Number
- yes
- Narcissistic Number
- no
- Collatz Steps
- 137
- 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
- yes
- Odd
- no
Appears in sequences
- Theta series of A*_10 lattice.at n=25A023922
- Number of partitions of n that do not contain 3 as a part.at n=35A027337
- a(n) = 6*n^2.at n=33A033581
- Triangle whose (i,j)-th entry is binomial(i,j)*3^(i-j)*11^j.at n=12A038229
- Triangle whose (i,j)-th entry is binomial(i,j)*11^(i-j)*3^j.at n=12A038317
- Composite numbers divisible by the palindromic sum of their prime factors (counted with multiplicity).at n=17A046358
- Composite numbers divisible by the palindromic sum of their palindromic prime factors (counted with multiplicity).at n=9A046366
- Number of 3-element ordered antichain covers of an unlabeled n-element set.at n=8A056074
- Local ranks of terms of A057122.at n=37A057124
- 2nd level triangle related to Eulerian numbers and binomial transforms (triangle of Eulerian numbers is first level and triangle with Z(0,0)=1 and Z(n,k)=0 otherwise is 0th level).at n=52A062253
- (Sum of digits of n)^4 - (sum of digits of n^4).at n=18A069978
- GCD of n! and the reverse of n!.at n=31A071678
- Numbers n such that two applications of 'Reverse and Subtract' lead to n, whereas one application does not lead to n.at n=1A072141
- Sum of first n perfect powers.at n=32A076408
- Numbers n such that the digital binary sum of n equals core(n), the squarefree part of n.at n=30A077476
- a(n) = A078218(n)/n.at n=20A078810
- Square root of coefficients of power series: A083352(x)^2 + A083352(x) - 1; term-by-term square root of A083353.at n=77A083354
- Numbers k for which the quotient q(k)=(k+rev(k))/abs(k-rev(k)) is an integer.at n=11A087993
- Indices of primes in sequence defined by A(0) = 89, A(n) = 10*A(n-1) - 11 for n > 0.at n=14A101078
- Numbers n such that reversal(n)=2n/3.at n=1A101704