16189
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 25
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 16190
- Proper Divisor Sum (Aliquot Sum)
- 1
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 16188
- Möbius Function
- -1
- Radical
- 16189
- Omega Function (Ω)
- 1
- Little Omega Function (ω)
- 1
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
- 159
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- yes
- Composite Number
- no
- Semiprime
- no
- Squarefree Number
- yes
- Prime Power
- yes
- Prime Factorization
- no
- Twin Prime
- yes
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 1882
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Number of SiC polytypes that repeat after 2n layers.at n=30A011959
- a(n) = 2^n - n^2 + 1.at n=14A030110
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 82 ones.at n=18A031850
- Numerators of continued fraction convergents to sqrt(821).at n=8A042584
- Smallest prime p having n different cycles in decimal expansions of k/p, k=1..p-1.at n=18A054471
- Balanced primes of order four.at n=15A082079
- Primes p such that the sum of the digits of p is not prime, but the sum of the cubes of the digits of p is prime.at n=20A091365
- Primes congruent to 24 mod 53.at n=30A142554
- Primes congruent to 23 mod 59.at n=35A142750
- Primes congruent to 24 mod 61.at n=31A142822
- Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,1 4,0 4,1 polyhexes in any orientation on a planar nXnXn triangular grid.at n=6A155294
- Central term of nine successive primes whose average is a prime.at n=28A180457
- Unique terms in sequence A210144.at n=36A214196
- n-th prime p such that (p+n)^2+n is prime but (p+j)^2+j is not prime for all 0<j<n.at n=10A238663
- Greater of the pairs of twin primes in A001122.at n=39A319249
- Row 2 of A328464: a(n) = A276156(4n - 2) / 2.at n=27A328465
- Triangle read by rows: T(n,k) is the number of n+2-sided polygons whose points lie on a circle and with the property that one makes k turns on itself, always in the same direction (right or left) while following its edges, 1 <= k <= ceiling(n/2).at n=43A343257
- Primes p such that 2*p-1 and (2*p-1)^2+(2*p)^2 are also prime.at n=25A347165
- Number of integer partitions of n whose multiset multiplicity kernel is a submultiset.at n=46A367684
- Number of k in the range 2^n <= k < 2^(n+1) whose shortest addition chain does not have length n, n+1 or n+2.at n=14A372152