13069
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 14944
- Proper Divisor Sum (Aliquot Sum)
- 1875
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 11196
- Möbius Function
- 1
- Radical
- 13069
- 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
- 138
- 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
- Numbers k such that A049614(k) - A000040(k) is prime.at n=17A078745
- Number of primes of the form 7k+4 less than 10^n.at n=5A091123
- Numbers n occurring in binary representation of n*(n+1)/2.at n=43A092734
- Semiprimes in A056107.at n=18A113525
- a(n) = 484*n + 1.at n=26A158326
- a(n) = 12*n^2 + 1.at n=33A158480
- Demi-tribonacci numbers (rounding down): a(0)=a(1)=0, a(2)=2; a(n) = floor( (a(n-1)+a(n-2)+a(n-3))/2 ).at n=49A180234
- Number of nondecreasing arrangements of n+2 numbers in 0..5 with each number being the sum mod 6 of two others.at n=12A183908
- Numbers n such that Q(sqrt(n)) has class number 9.at n=21A218041
- Fundamental discriminants of real quadratic number fields with class number 9.at n=13A218159
- Number of partitions of n such that m(1) > m(2), where m = multiplicity.at n=37A240056
- Indices of zeros in A268819.at n=54A269157
- a(n) = (n-1)! + 1 mod n^3.at n=32A301317
- a(n) = A276086(n) - n, where A276086 is the primorial base exp-function.at n=56A351225