16281
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 24752
- Proper Divisor Sum (Aliquot Sum)
- 8471
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 10692
- Möbius Function
- 0
- Radical
- 201
- Omega Function (Ω)
- 6
- 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
- 115
- 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
- Odd heptagonal numbers (A000566).at n=40A014637
- a(n) = (2*n + 1)*(5*n + 1).at n=40A033571
- Sums of 5 distinct powers of 5.at n=7A038477
- Numbers n such that n | 9^n + 8^n + 7^n + 6^n + 5^n + 4^n.at n=29A057260
- Number of orbits of length n under the map whose periodic points are counted by A061688.at n=2A091201
- Number of Pythagorean quadruples mod n; i.e., number of solutions to w^2 + x^2 + y^2 = z^2 mod n.at n=26A096018
- The largest part summed over all partitions of n in which every integer from the smallest part to the largest part occurs.at n=46A117469
- Heptagonal numbers for which the sum of the digits is also a heptagonal number.at n=21A117650
- Row sums of number triangle A124816.at n=14A124818
- a(1)=1, a(n)=a(n-1)+n^1 if n odd, a(n)=a(n-1)+ n^3 if n is even.at n=17A140145
- List of different composite numbers in Pascal-like triangles with index of asymmetry y = 1 and index of obliqueness z = 0 or z = 1.at n=47A141065
- Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, -1, 0), (0, 1, 1), (1, 0, 1), (1, 1, 0)}.at n=7A151084
- Triangle read by rows, T(n,k) for 0<=k<=n, generalizes the colored Motzkin paths of A107264.at n=50A201638
- a(n) = 1+2*(d1 + 1)*(d2 + 1)*...*(dk + 1), where d1, d2, ..., dk are the prime factors of the n-th Fermat pseudoprime to base 2 A001567(n).at n=18A216646
- a(n) = n*(5*n - 3)*(25*n^2 - 15*n - 6)/8.at n=6A264891
- a(n) = (n + 1)^2*(5*n^2 + 10*n + 2)/2.at n=8A269237
- Numbers k such that k![4] + 2 is prime, where k![4] = A007662(k) = quadruple factorial.at n=38A283553
- Numbers that are divisible by the product of their factorial base digits (A208575).at n=37A286590
- Decimal representation of the diagonal from the corner to the origin of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 513", based on the 5-celled von Neumann neighborhood.at n=13A288811
- Decimal representation of the diagonal from the corner to the origin of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 587", based on the 5-celled von Neumann neighborhood.at n=13A289533