11121
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 6
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 16224
- Proper Divisor Sum (Aliquot Sum)
- 5103
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 6720
- Möbius Function
- -1
- Radical
- 11121
- 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
- 130
- 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
- Numbers that contain only 1's and 2's. Nonempty binary strings of length n in lexicographic order.at n=32A007931
- Pseudoprimes to base 40.at n=35A020168
- Sum of the products of the primes taken 2 at a time from the first n primes.at n=10A024447
- Numbers whose product of digits is prime.at n=44A028842
- 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 70.at n=26A031568
- Numbers having four 1's in base 10.at n=13A043496
- 23-gonal numbers: a(n) = n(21n-19)/2.at n=33A051875
- a(n) is the decimal concatenation of n and n^2.at n=10A053061
- Product of the digits of n divides the sum of the digits of n.at n=41A055931
- The zero-free, right-to-left factorial walk encoding for each rooted plane tree encoded by A014486. Sequence A071155 shown with factorial expansion (A007623).at n=37A071157
- Factorial expansion of A071156.at n=23A071158
- Integers whose decimal expansion start with 1, do not contain zeros and each successive digit to the right is at most one greater than the previous digit.at n=24A071159
- Leftmost 1 is converted to a 2, which then propagates one step at a time until it is rightmost; then it changes to a pair of 1's and the process repeats.at n=19A071762
- List of codewords in binary lexicode with Hamming distance 5 written as decimal numbers.at n=37A075931
- Numbers n such that sum of squares of even digits of n equals sum of squares of odd digits of n.at n=2A076164
- Left-to-right binary enumeration.at n=38A081242
- a(1) = 1, then the smallest number not included earlier and not a string of 1's such that the concatenation a(n), a(n+1) is a palindrome.at n=9A083122
- Another lazy binary representation of n: similar to A089591 except that the single carry is performed before the increment instead of after.at n=33A089600
- a(n) = 124 written in base n.at n=2A095638
- a(n) = 124 written in base 11 - n.at n=8A095639