11212
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 7
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 19628
- Proper Divisor Sum (Aliquot Sum)
- 8416
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 5604
- Möbius Function
- 0
- Radical
- 5606
- Omega Function (Ω)
- 3
- 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
- 99
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- 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
- yes
- Odd
- no
Appears in sequences
- Numbers k such that (k / product of digits of k) is 1 or a prime.at n=32A001103
- Primes in ternary.at n=31A001363
- Number of words of length n in a certain language.at n=46A005819
- Generalized Lucas numbers.at n=12A006493
- Numbers that contain only 1's and 2's. Nonempty binary strings of length n in lexicographic order.at n=35A007931
- a(n) = floor( n*(n-1)*(n-2)*(n-3)/32 ).at n=26A011942
- Numbers k such that the continued fraction for sqrt(k) has period 88.at n=27A020427
- Number of compositions of n into prime parts.at n=27A023360
- Positions of cubes among the powers of primes (A000961).at n=23A024627
- a(n) is the position of 7^n among the powers of primes (A000961).at n=6A025472
- Number of 6-ary rooted trees with n nodes and height at most 8.at n=13A036625
- 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=28A071159
- Primes of form 4k+3 written in base 3.at n=16A072805
- Successive factors of the Fibonacci word A003842.at n=1A074983
- Numbers k such that 2^(k+1) - 1 is prime.at n=22A090748
- Exponents m such that 1-A065395(2^m) is a power of 2, where A065395(n) = sigma(phi(n)) - phi(sigma(n)).at n=27A092591
- List of Lyndon words on {1,2} sorted first by length and then lexicographically.at n=10A102659
- List of Lyndon words on {1,2,3} sorted first by length and then lexicographically.at n=38A102660
- Numbers with digits 1 and 2 and at least one of each.at n=26A111066
- Concatenation of the numbers of equal successive digits of previous two terms, starting with a(1)=a(2)=1.at n=11A113720