5105
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 11
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 6132
- Proper Divisor Sum (Aliquot Sum)
- 1027
- 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
- 4080
- Möbius Function
- 1
- Radical
- 5105
- 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
- 59
- 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 points on surface of tricapped prism: a(n) = 7*n^2 + 2 for n > 0, a(0)=1.at n=27A005919
- Coordination sequence T3 for Zeolite Code MOR.at n=46A008184
- Expansion of e.g.f.: exp(tan(tanh(x))).at n=11A009241
- The sequence m(n) in A022905.at n=38A022907
- Numbers that are the sum of 4 distinct positive cubes in exactly 3 ways.at n=21A025410
- Numbers that are the sum of 4 distinct positive cubes in 3 or more ways.at n=22A025413
- Least sum of 4 positive cubes in exactly n ways.at n=4A025420
- Odd numbers seen in decimal expansion of Pi (disregarding the decimal period) contiguous, smallest and distinct.at n=19A050817
- Numbers k such that 60*R_k + 7 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=24A056657
- Numbers n such that 1n1, 3n3, 7n7 and 9n9 are all primes.at n=11A059677
- Convoluted convolved Fibonacci numbers G_5^(r).at n=43A089109
- Sign twisted convoluted convolved Fibonacci numbers H_5^(r).at n=43A089110
- Numbers n such that 6n+5, 6n+11, 6n+17, 6n+23 are consecutive primes or 6n+1, 6n+7, 6n+13, 6n+19 are consecutive primes.at n=18A090833
- Numbers k such that 6*k+1, 6*k+7, 6*k+13, 6*k+19 are consecutive primes.at n=8A090839
- Sum of the primes in ordered 3 X 3 prime squares.at n=11A105089
- Semiprimes a such that there exist three semiprimes b, c and d with a^3=b^3+c^3+d^3.at n=33A113490
- Start with 1015 and repeatedly reverse the digits and add 4 to get the next term.at n=1A117807
- Start with 1027 and repeatedly reverse the digits and add 16 to get the next term.at n=67A119455
- Start with 1013 and repeatedly reverse the digits and add 2 to get the next term.at n=3A120214
- Moebius transform of A037019.at n=34A130113