16229
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 20
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 16230
- 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
- 16228
- Möbius Function
- -1
- Radical
- 16229
- 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
- 115
- 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
- 1886
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Numbers k such that the continued fraction for sqrt(k) has period 67.at n=19A020406
- Primes that remain prime through 3 iterations of function f(x) = 9x + 2.at n=33A023296
- Primes that remain prime through 4 iterations of function f(x) = 9x + 2.at n=12A023324
- a(n) is the number of prime powers <= 3^n.at n=11A024623
- Numbers whose base-5 representation contains exactly three 0's and three 4's.at n=12A045217
- Discriminants of real quadratic fields with class number 1 and related continued fraction period length of 23.at n=25A051964
- Primes p such that p + 2 and p*(p + 2) + 2 are primes.at n=31A108013
- Smallest prime factor of the reverse concatenation of the first n odd numbers.at n=30A109837
- Lesser of a twin-prime pair where both are expressible as the sum of two triangular numbers.at n=30A118638
- Expansion of c(x*c(x)), where c(x) is the g.f. for A000108.at n=8A127632
- Primes of the form 210k + 59.at n=38A140852
- Primes congruent to 11 mod 53.at n=35A142541
- Primes congruent to 4 mod 59.at n=32A142731
- Primes congruent to 3 mod 61.at n=32A142801
- Primes p such that 6p-7, 6p-5, 6p-1 are all prime.at n=36A157042
- Primes of the form p^2+100, where p is prime.at n=16A182476
- Positions of prime powers p^e with p < e within A000961.at n=24A192187
- Indices of records in A194591 restricted to prime indices.at n=11A194635
- Primes of the form 6n^2 + 5.at n=21A201600
- Number of ordered triples (w,x,y) with all terms in {-n,...-1,1,...,n} and 3w+x+y>0.at n=16A211628