11689
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
- 11690
- 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
- 11688
- Möbius Function
- -1
- Radical
- 11689
- 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
- 81
- 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
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 1403
- 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 odd period and if the last term of the periodic part is deleted the two central terms are both 43.at n=0A031631
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 52 ones.at n=32A031820
- Denominators of continued fraction convergents to sqrt(523).at n=9A042001
- Primes of the form 16*m^2 + 25, m=1,3,5,...at n=6A087856
- Primes of the form 16*m^2 + 25 for m=1,2,3,...at n=12A087857
- 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=13A091365
- Integer part of the area of circles with prime radii.at n=17A097427
- Primes of the form floor(Pi*p^2) where p is a prime.at n=3A134075
- Primes of the form 76x^2+20xy+145y^2.at n=21A140629
- Primes congruent to 34 mod 37.at n=35A142143
- Primes congruent to 4 mod 41.at n=36A142201
- Primes congruent to 36 mod 43.at n=35A142285
- Primes congruent to 33 mod 47.at n=29A142384
- Primes congruent to 27 mod 49.at n=32A142437
- Primes congruent to 29 mod 53.at n=28A142559
- Primes congruent to 29 mod 55.at n=37A142622
- Primes congruent to 4 mod 57.at n=37A142667
- Primes congruent to 7 mod 59.at n=20A142734
- Primes congruent to 38 mod 61.at n=23A142836
- Primes congruent to 34 mod 63.at n=39A142908