5475
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 21
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 9176
- Proper Divisor Sum (Aliquot Sum)
- 3701
- 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
- 2880
- Möbius Function
- 0
- Radical
- 1095
- Omega Function (Ω)
- 4
- 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
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 41
- 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) = 4*n^2 - 1.at n=37A000466
- Number of bicentered 3-valent (or boron, or binary) trees with n nodes.at n=18A000673
- a(n) = (4*n+1)*(4*n+3).at n=18A001539
- Numbers k such that 33*2^k - 1 is prime.at n=32A002240
- a(n) = a(n-1) + a(n - 1 - number of even terms so far).at n=37A006336
- Exponentiation of g.f. for Pell numbers.at n=7A006669
- Pseudoprimes to base 74.at n=28A020202
- Sequence arising in search for Legendre sequences.at n=15A039795
- Number of unlabeled ternary cacti having n triangles.at n=8A052393
- Numbers k such that k | sigma_6(k).at n=28A055710
- Numbers k such that k and its reversal are both multiples of 15.at n=38A062905
- Non-palindromic number and its reversal are both multiples of 15.at n=32A062914
- Ninth column of quintinomial coefficients.at n=6A064058
- Smallest m such that A065623(m) = n.at n=33A065624
- a(n) = floor(n^sqrt(n)).at n=11A066641
- Numbers k such that reverse(gpf(k)) = gpf(k+1), where gpf(n) = A006530(n); a(1)=1.at n=16A071844
- Numbers k such that the largest prime power factor of k equals floor(sqrt(k)).at n=32A081807
- Numbers n such that ((n-1)^2+1)/2 and n^2+1 and ((n+1)^2+1)/2 are prime if n is even or (n-1)^2+1 and (n^2+1)/2 and (n+1)^2+1 are prime if n is odd.at n=29A082612
- a(n) = Sum_{i=1..n} A005235(i).at n=40A097589
- Numbers k such that k*(k+5) gives the concatenation of a number m with itself.at n=9A116289