9391
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 22
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 9392
- Proper Divisor Sum (Aliquot Sum)
- 1
- 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
- 9390
- Möbius Function
- -1
- Radical
- 9391
- 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
- 60
- 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
- 1161
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Number of 1's in n-th term of A022482.at n=32A022484
- Primes that remain prime through 3 iterations of function f(x) = 3x + 8.at n=9A023279
- Numerator of Sum_{k=1..n} 1/phi(k).at n=32A028415
- 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 95.at n=34A031593
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 78 ones.at n=5A031846
- Numerators of continued fraction convergents to sqrt(754).at n=7A042452
- Numbers whose base-5 representation contains exactly three 0's and two 3's.at n=26A045201
- Primes of the form 30*p + 1 where p is also prime.at n=25A051646
- a(n) = 6*n^2 + 6*n + 31.at n=39A060834
- Primes of the form 6*k^2 + 6*k + 31.at n=34A060844
- Cycle of the inventory sequence (as in A063850) starting with n consists of prime numbers.at n=29A078970
- Primes that are a sum of twin primes and their indices.at n=31A088187
- Primes from merging of 4 successive digits in decimal expansion of the Golden Ratio, (1+sqrt(5))/2.at n=4A103810
- Primes which are the reverse concatenation of two consecutive odd numbers.at n=13A104332
- Primes p such that p's set of distinct digits is {1,3,9}.at n=19A108383
- Primes that can be written as the sum of 13 consecutive primes.at n=36A127341
- Primes in A132286.at n=18A132287
- Numbers k such that k and k^2 use only the digits 0, 1, 3, 8 and 9.at n=34A136852
- Prime numbers p such that p^3 - p + 1 and p^3 + p - 1 are both primes.at n=18A137463
- Primes of the form 24x^2+55y^2.at n=38A140008