11089
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 11956
- Proper Divisor Sum (Aliquot Sum)
- 867
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 10224
- Möbius Function
- 1
- Radical
- 11089
- 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
- 55
- 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
- Strong pseudoprimes to base 98.at n=18A020324
- Numbers k such that the continued fraction for sqrt(k) has period 99.at n=7A020438
- a(n) = a(n-1) + a(n-2) + 1, with a(0) = 1 and a(1) = 9.at n=16A022323
- a(n) = (1/2)*s(n+3), where s = A025251.at n=15A025252
- Numbers whose set of base-15 digits is {3,4}.at n=21A032839
- Number of primitive (aperiodic) step shifted (decimated) sequence structures using a maximum of four different symbols.at n=9A056403
- Centered 21-gonal numbers.at n=32A069178
- Prefixing, suffixing or inserting a 9 in the number anywhere gives a prime.at n=42A069833
- Sum of first n perfect powers.at n=38A076408
- Odd numbers n for which 13 is the smallest i (>= 1) with Jacobi symbol J(i,n) getting either a value 0 or -1.at n=35A112076
- Number of compositions of n into odd blocks with one element in each block distinguished.at n=13A119749
- 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, -1, 1), (-1, 1, -1), (-1, 1, 1), (0, 0, 1), (1, 0, -1)}.at n=10A148185
- Numerator of Euler(n, 6/25).at n=3A156969
- Diagonal sums of number triangle [k<=n]*C(n,2n-2k)2^(n-k)A000108(n-k).at n=16A160565
- a(n) = 8*n^2 + 20*n + 1.at n=36A161617
- a(n) = n^3 + (1-n)^2.at n=22A168297
- The sums of pairs of adjacent terms are the odd palindromic primes in ascending order.at n=28A181884
- Concentric 24-gonal numbers.at n=43A195158
- Number of n X 2 0..1 arrays with rows, columns and antidiagonals unimodal and diagonals nondecreasing.at n=20A223764
- Numbers k such that k divides the sum of the first k primes with odd indices.at n=8A263549