5461
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
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 5632
- Proper Divisor Sum (Aliquot Sum)
- 171
- 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
- 5292
- Möbius Function
- 1
- Radical
- 5461
- 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
- 15
- 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
- Octagonal numbers: n*(3*n-2). Also called star numbers.at n=43A000567
- Boustrophedon transform of Catalan numbers.at n=7A000753
- Deceptive nonprimes: composite numbers k that divide the repunit R_{k-1}.at n=11A000864
- a(2n) = 2*a(2n-1), a(2n+1) = 2*a(2n)+1 (also a(n) is the n-th number without consecutive equal binary digits).at n=13A000975
- Jacobsthal sequence (or Jacobsthal numbers): a(n) = a(n-1) + 2*a(n-2), with a(0) = 0, a(1) = 1; also a(n) = nearest integer to 2^n/3.at n=14A001045
- Fermat pseudoprimes to base 2, also called Sarrus numbers or Poulet numbers.at n=16A001567
- Denominator of Pi^(2n)/(Gamma(2n)*(1-2^(-2n))*zeta(2n)).at n=6A002425
- a(n) = (4^n - 1)/3.at n=7A002450
- Numerators of coefficients for central differences M_{4}^(2*n).at n=6A002675
- Numerators of the Taylor coefficients of (e^x-1)^2.at n=13A002678
- Divisors of 2^14 - 1.at n=6A003525
- Divisors of 2^28 - 1.at n=25A003536
- Divisors of 2^42 - 1.at n=26A003547
- Pseudoprimes to base 5.at n=10A005936
- Pseudoprimes to base 10.at n=21A005939
- Denominators of worst case for Engel expansion.at n=32A006540
- Denominators of worst case for Engel expansion.at n=31A006540
- Euler pseudoprimes: composite numbers n such that 2^((n-1)/2) == +-1 (mod n).at n=10A006970
- Cardinalities of Sperner families on 1,...,n.at n=7A007695
- Indices of last windows of trapezoidal maps.at n=13A007873