16119
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
- 3
Divisibility
- Divisor Count
- 10
- Divisor Sum
- 24200
- Proper Divisor Sum (Aliquot Sum)
- 8081
- 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
- 597
- Omega Function (Ω)
- 5
- 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
- 53
- 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
- Number of diagonally symmetric polyominoes with n cells.at n=18A006748
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 11 ones.at n=36A031779
- Number of permutations with certain forbidden subsequences.at n=10A054393
- Numbers k such that sigma(k+1) - sigma(k) = k + 1.at n=3A067816
- Duplicate of A067816.at n=3A076629
- Triangle of numbers, called Y(1,3), related to generalized Catalan numbers A064063(n) = C(3;n).at n=23A116868
- Related to enumeration of free catapolyoctagons (see Cyvin reference for precise definition).at n=6A121120
- 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, 0, 0), (0, -1, 1), (1, 0, -1), (1, 0, 1), (1, 1, 1)}.at n=7A150988
- G.f. A(x) satisfies: A(x)^-3 + A(-x)^-3 = 2 and A(x)^3 - A(-x)^3 = 18*x.at n=5A196865
- Nonnegative values x of solutions (x, y) to the Diophantine equation x^2 + (x+401)^2 = y^2.at n=7A207060
- Numbers n such that antisigma(n) = antisigma(k) has solution for distinct numbers n and k.at n=6A231364
- Number of subsets of {1,...,n} containing n and having at least one set partition into 3 blocks with equal element sum.at n=16A232534
- Smallest m such that A258062(m) = n.at n=56A258063
- Numbers k such that (25*10^k + 161)/3 is prime.at n=21A281110
- Starts of runs of 3 consecutive integers that are divisible by the cube of their least prime factor.at n=1A365868
- Number of subsets of the first n twin primes (A001097) whose sum is a twin prime.at n=17A385571
- Numbers k such that A003415(k) == A276085(k) (mod 5^5), where A003415 is the arithmetic derivative and A276085 is the primorial base log-function.at n=13A391865