16516
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
- 2
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 28910
- Proper Divisor Sum (Aliquot Sum)
- 12394
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 8256
- Möbius Function
- 0
- Radical
- 8258
- Omega Function (Ω)
- 3
- 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
- 190
- 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
- yes
- Odd
- no
Appears in sequences
- Numbers that are the sum of 6 positive 7th powers.at n=29A003373
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 66 ones.at n=25A031834
- Base-8 palindromes that start with 4.at n=20A043024
- Number of length n+3 0..n arrays with no four elements in a row with pattern abba (possibly a=b) and new values 0..n introduced in 0..n order.at n=5A243026
- Number of length n+3 0..6 arrays with no four elements in a row with pattern abba (possibly a=b) and new values 0..6 introduced in 0..6 order.at n=5A243031
- Expansion of x*(1+11*x-10*x^3)/(1-12*x^2+10*x^4).at n=8A249312
- Number of (6+2)X(n+2) 0..1 arrays with every 3X3 subblock sum of the two sums of the diagonal and antidiagonal minus the two minimums of the central column and central row nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=8A254912
- Number of partitions of n for which the number of even parts is equal to the positive alternating sum of the parts.at n=51A277579
- Expansion of (1+11*x+24*x^2+11*x^3+x^4)/(1-x)^5.at n=9A294433
- a(n) = Fibbinary(2^n).at n=10A305876
- Number of uncrossed knight's walks as specified in A323700, counting isomorphisms only once.at n=5A323699
- Sum of the corners of a 2n+1 X 2n+1 square spiral.at n=31A325958
- Triangle read by rows: T(n,k) (1 <= k <= n) = number of ways to choose three points from an n X k grid of points which are the vertices of a triangle of nonzero area.at n=33A334705
- Square array T(n,k), n >= 1, k >= 1, read by antidiagonals, where T(n,k) = Sum_{1 <= x_1, x_2, ..., x_k <= n} gcd(x_1, x_2, ..., x_k).at n=48A344479