11391
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 15
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 15192
- Proper Divisor Sum (Aliquot Sum)
- 3801
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 7592
- Möbius Function
- 1
- Radical
- 11391
- 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
- 205
- 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
- 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 35.at n=39A031533
- a(n) = ceiling((n + 1/2)^3).at n=21A034131
- Numbers n such that 6*10^n + 4*R_n + 5 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=7A103037
- Numbers k such that 2^(2*k) - (2*k-1) is prime.at n=15A119386
- Number of n X n binary arrays with all ones connected only in a 11011-01110 pattern in any orientation.at n=7A147223
- Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 11011-01110 pattern in any orientation.at n=17A147225
- Number of partitions of n into parts occurring in '3x+1'-trajectory starting with n.at n=49A160000
- Partial sums of floor(2^n/23).at n=17A178457
- Sum of the numbers already removed (including the target number) in the first jump of a Sieve of Eratosthenes table.at n=24A179654
- Numbers k such that tau(k-1) = (tau(k))^2 = tau(k+1), where tau(k) = A000005(k) (number of divisors of k).at n=40A190266
- Number of n-bead necklaces labeled with numbers 1..6 allowing reversal, with no adjacent beads differing by more than 1.at n=11A208719
- a(n) = floor(M(g(n-1)+1, ..., g(n))), where M = harmonic mean and g(n) = n^3.at n=22A227012
- Numbers of pyramid polycubes of a given volume in dimension 5.at n=13A229924
- Indices of primes in the 10th-order Fibonacci number sequence, A127194.at n=28A257073
- Numbers k such that 8*10^k - 99 is prime.at n=21A280016
- Numbers missing from A317416.at n=11A317418
- Centered pentagonal numbers which are squarefree semiprimes.at n=27A381043
- Centered pentagonal numbers which are semiprimes.at n=27A382132