11481
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
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 15840
- Proper Divisor Sum (Aliquot Sum)
- 4359
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 7392
- Möbius Function
- -1
- Radical
- 11481
- Omega Function (Ω)
- 3
- Little Omega Function (ω)
- 3
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
- no
- Composite Number
- yes
- Semiprime
- no
- 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
- Sum of multinomial coefficients (n_1+n_2+...)!/(n_1!*n_2!*...) where (n_1, n_2, ...) runs over all integer partitions of n.at n=7A005651
- Pseudoprimes to base 88.at n=42A020216
- Number of partitions in parts not of the form 17k, 17k+3 or 17k-3. Also number of partitions with at most 2 parts of size 1 and differences between parts at distance 7 are greater than 1.at n=38A035964
- Numbers whose maximal base-9 run length is 4.at n=21A037999
- Numbers having four 6's in base 9.at n=1A043480
- a(n) = n*(n^2 - 6*n + 11)/6.at n=43A050407
- Numbers k that can be expressed as k = w + x = y*z with w*x = y^3 + z^3 where w, x, y, and z are all positive integers.at n=27A057372
- Integer part of log(n!)^(1 + log(1 + log(n))).at n=22A062443
- Nearest integer to log(n!)^(1 + log(1 + log(n))).at n=22A062444
- Centered 14-gonal numbers.at n=40A069127
- Least numbers m such that GCD of two consecutive values of cototients, i.e., gcd(cototient(m+1), cototient(m)) equals 2n - 1.at n=43A070017
- a(n) = B(2n,3)/B(2n) (see comment).at n=4A096046
- sigma(n)-phi(n) and sigma(n)+phi(n) are two palindromes greater than 2.at n=4A116031
- a(n) = 1681*n^2 - 984*n - 696.at n=2A118060
- Number of distinct values taken by the entropy for permutations of [1..n], where the entropy of a permutation pi is Sum_{k=1..n} (pi(k)-k)^2.at n=41A126972
- a(n) = 2*A000129(n) - 1.at n=10A133654
- Numbers k such that k and k^2 use only the digits 1, 3, 4, 6 and 8.at n=14A137026
- a(n)=a(n-1)+3a(n-2)+a(n-3).at n=12A137199
- Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 1), (0, 0, 1), (0, 1, -1), (1, -1, 1), (1, 1, 0)}.at n=7A150658
- a(n) = Sum_{k=0..binomial(n,2)} (-1)^k*A152534(n,k).at n=14A152536