8119
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 8496
- Proper Divisor Sum (Aliquot Sum)
- 377
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 7744
- Möbius Function
- 1
- Radical
- 8119
- Omega Function (Ω)
- 2
- 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
- 65
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- yes
- Squarefree Number
- yes
- 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
- Pell-Lucas numbers: numerators of continued fraction convergents to sqrt(2).at n=11A001333
- NSW numbers: a(n) = 6*a(n-1) - a(n-2); also a(n)^2 - 2*b(n)^2 = -1 with b(n) = A001653(n+1).at n=5A002315
- Numerators of continued fraction convergents to fifth root of 2.at n=9A002362
- Interleave denominators (A000129) and numerators (A001333) of convergents to sqrt(2).at n=23A002965
- Octahedral numbers: a(n) = n*(2*n^2 + 1)/3.at n=23A005900
- Expansion of (1+x^2)/((1-x)^2*(1-x^2)^2).at n=44A005993
- Primitive parts of Pell numbers.at n=21A008555
- Pseudoprimes to base 22.at n=39A020150
- Pseudoprimes to base 58.at n=33A020186
- Strong pseudoprimes to base 58.at n=10A020284
- Strong pseudoprimes to base 97.at n=13A020323
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 89.at n=17A031587
- Numbers whose set of base-9 digits is {1,2}.at n=40A032930
- Base 9 digits are, in order, the first n terms of the periodic sequence with initial period 1,2.at n=4A037486
- Denominators of continued fraction convergents to sqrt(714).at n=10A042375
- Base-9 palindromes that start with 1.at n=39A043028
- a(n) = A033001(n)/4.at n=45A043307
- Numbers k such that x^k + x^10 + 1 is irreducible over GF(2).at n=8A057480
- Denominators of ordinary continued fraction convergents for 2*zeta(3).at n=7A060808
- Intrinsic 9-palindromes: n is an intrinsic k-palindrome if it is a k-digit palindrome in some base.at n=35A060879