15169
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 22
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 19008
- Proper Divisor Sum (Aliquot Sum)
- 3839
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 11760
- Möbius Function
- -1
- Radical
- 15169
- Omega Function (Ω)
- 3
- 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
- 40
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- 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
- Partial sums of A001935; at one time this was conjectured to agree with A007478.at n=35A014605
- T(n,3), array T as in A054134.at n=9A054137
- Number of singular points on n-th order Chmutov surface.at n=33A057870
- Column 2 of triangle A128562.at n=15A128563
- a(n) = number of 7-digit primes with digit sum n, where n runs through the non-multiples of 3 in the range [2..62].at n=28A178876
- Number of (n+3) X 7 binary arrays with every 4 X 4 subblock commuting with each horizontal and vertical neighbor 4 X 4 subblock.at n=12A188100
- Stack polyominoes with square core.at n=43A188674
- Number of distinct bags of distinct sequences of 1s and 2s such that the sum of all terms is n.at n=14A200544
- Power ceiling-floor sequence of (golden ratio)^4.at n=4A214992
- Number of binary arrays indicating the locations of trailing edge maxima of a random length-n 0..7 array extended with zeros and convolved with 1,2,1.at n=19A222126
- Numbers k such that (56*10^k + 367)/9 is prime.at n=16A294231
- Two-column table read by rows: Primitive distinct pairs that have the same value of phi, sigma, and tau.at n=24A322688
- Expansion of (1 + 9*x) / (1 - 2*x - 11*x^2).at n=6A328606
- a(n) = Sum_{k=1..n} 2^(n - floor(n/k)).at n=11A345108
- Numerators of the partial sums of the reciprocals of the sum of bi-unitary divisors function (A188999).at n=33A379615