11001
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 3
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 15520
- Proper Divisor Sum (Aliquot Sum)
- 4519
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 6912
- Möbius Function
- -1
- Radical
- 11001
- 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
- yes
- Narcissistic Number
- no
- Collatz Steps
- 68
- 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
- Primes in ternary.at n=28A001363
- Squares written in base 2.at n=5A001737
- Least positive multiple of n written in base 6 using only 0 and 1.at n=16A004286
- Least positive multiple of n written in base 7 using only 0 and 1.at n=14A004287
- Least positive multiple of n written in base 9 using only 0 and 1.at n=22A004289
- Least positive multiple of n that when written in base 10 uses only 0's and 1's.at n=18A004290
- The binary numbers (or binary words, or binary vectors, or binary expansion of n): numbers written in base 2.at n=25A007088
- Binary reflected Gray code.at n=17A014550
- Erroneous version of A307102.at n=23A019513
- Quotient of 'base-2' division described in A032533.at n=14A032534
- Largest number using only digits <= n that does not repeat a pair of consecutive digits.at n=0A034712
- Roots of 'non-palindromic cubes remaining cubic when written backwards'.at n=3A035125
- Lexicographically earliest strictly increasing base 3 autovarious sequence: a(n) = number of distinct a(k) mod 3^n (written in base 3).at n=15A037091
- Positive numbers having the same set of digits in base 2 and base 10.at n=21A037415
- Numbers k such that k is a substring of its base-2 representation.at n=19A038102
- Lexicographically earliest strictly increasing base 4 autovarious sequence: a(n) = number of distinct a(k) mod 4^n (written in base 4).at n=15A038113
- Sums of 3 distinct powers of 10.at n=7A038445
- a(n) is the negabinary expansion of n, that is, the expansion of n in base -2.at n=9A039724
- a(n) * a(n)_reversed is a palindrome (and a(n) is not palindromic).at n=39A048344
- a(n)^2 is a square whose decimal expansion digits occur with an exact frequency of 3.at n=3A052095