11831
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 14
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 11832
- 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
- 11830
- Möbius Function
- -1
- Radical
- 11831
- 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
- 174
- 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
- yes
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 1419
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Number of positive integers <= 2^n of form 3 x^2 + 8 y^2.at n=17A054165
- Fourth term of strong prime quintets: p(m-2)-p(m-3) > p(m-1)-p(m-2) > p(m)-p(m-1) > p(m+1)-p(m).at n=30A054811
- Numbers n such that phi(reverse(n)) = sigma(n).at n=8A070835
- Sum of the reverses of the first n primes.at n=44A071602
- Primes p such that the period of the decimal expansion of 1/p is a square.at n=18A072858
- k-th lower twin prime, where k is the n-th Fibonacci number.at n=12A093306
- Larger of two consecutive Sophie Germain primes with the same digital sum.at n=28A118507
- Primes p such that |100-p|, |1000-p|, |10000-p| and |100000-p| are also primes.at n=19A126021
- Primes p for which the period length of 1/p is a perfect power, A001597.at n=25A128948
- Primes p such that p+2, n*(p+2)+6 and p*(p+2)+8 are also prime.at n=5A130735
- Primes among variant of permutational numbers A134750.at n=37A134766
- Primes of the form 210n+71.at n=29A140856
- Primes congruent to 28 mod 37.at n=34A142137
- Primes congruent to 23 mod 41.at n=38A142220
- Primes congruent to 6 mod 43.at n=34A142255
- Primes congruent to 34 mod 47.at n=29A142385
- Primes congruent to 22 mod 49.at n=31A142432
- Primes congruent to 12 mod 53.at n=29A142542
- Primes congruent to 6 mod 55.at n=34A142605
- Primes congruent to 31 mod 59.at n=24A142758