11611
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 10
- Digital Root
- 1
- Palindromic Number
- yes
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 12312
- Proper Divisor Sum (Aliquot Sum)
- 701
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 10912
- Möbius Function
- 1
- Radical
- 11611
- 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
- 143
- 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
- Ceiling of Gamma(n+3/5)/Gamma(3/5).at n=8A020128
- Number of partitions of n into parts not of the form 9k, 9k+4 or 9k-4. Also number of partitions with at most 3 parts of size 1 and differences between parts at distance 3 are greater than 1.at n=44A035943
- Base 10 palindromes that start with 1.at n=38A043036
- Numbers having four 1's in base 10.at n=25A043496
- Largest palindromic substring in 5^n.at n=26A046263
- Number of nonempty subsets of {1,2,...,n} in which exactly 2/3 of the elements are <= (n-4)/2.at n=19A048062
- A list of equal temperaments (equal divisions of the octave) whose nearest scale steps are closer and closer approximations to the ratios of two tones of musical harmony: the perfect 4th, 4/3 and its complement the perfect 5th, 3/2.at n=19A060528
- Numbers k such that k and its reversal are both multiples of 17.at n=35A062906
- Numbers n of the form k + reverse(k) for exactly two k.at n=27A072040
- Matrix product of unsigned Stirling1-triangle |A008275(n,k)| and Stirling1-triangle A008275(n,k).at n=38A079642
- Palindromes whose product of digits is a positive palindrome.at n=36A082207
- Palindromic time display in hours, minutes, seconds on a six spaced 24-hour digital clock, using hours 1-24.at n=16A082567
- Consider all (2n+1)-digit palindromic primes of the form 90...0M0...09 (so that M is a palindrome with <= 2n-1 digits); a(n) = smallest such M.at n=47A100957
- Near-repunit semiprimes.at n=27A105993
- Concatenation of palindrome k and its 10's complement is prime.at n=30A108537
- Semiprimes in A054556.at n=16A113693
- Semiprimes for which both the sum and the product of the digits is also a semiprime.at n=32A118690
- Palindromic composites such that some digit permutation is prime.at n=22A119378
- G.f. of the z^1 coefficients of the FP1 in the second column of the A156921 matrix.at n=9A156928
- A triangular sequence:t(n,m)=A033306(n,m)-A033306(n,0)+1.at n=40A174640