1011
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 3
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 1352
- Proper Divisor Sum (Aliquot Sum)
- 341
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 672
- Möbius Function
- 1
- Radical
- 1011
- 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
- yes
- Narcissistic Number
- no
- Collatz Steps
- 62
- 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
- Numbers written in base of triangular numbers.at n=13A000462
- Double-bitters: only even length runs in binary expansion.at n=29A001196
- a(1)=0, a(2n) = a(n)+1, a(2n+1) = 10*a(n+1).at n=37A001202
- Primes in ternary.at n=10A001363
- a(n) = n concatenated with n + 1.at n=9A001704
- Numbers that are the sum of 12 positive 5th powers.at n=46A003357
- Divisors of 2^42 - 1.at n=18A003547
- For m=2,3,..., write m in bases 2,3,..,m.at n=45A004053
- For m=2,3,..., write m in bases m,m-1,...,3,2.at n=54A004209
- Least positive multiple of n written in base 3 using only 0 and 1.at n=30A004283
- Least positive multiple of n written in base 4 using only 0 and 1.at n=22A004284
- Least positive multiple of n written in base 7 using only 0 and 1.at n=12A004287
- Least positive multiple of n written in base 7 using only 0 and 1.at n=8A004287
- Least positive multiple of n written in base 7 using only 0 and 1.at n=26A004287
- Primes written in base 2.at n=4A004676
- Primes written in base 5.at n=31A004679
- Primes written in base 6.at n=47A004680
- Numbers n such that n! has a square number of digits.at n=24A006488
- Convert the last term from decimal to binary! a(1)=3.at n=2A006938
- The binary numbers (or binary words, or binary vectors, or binary expansion of n): numbers written in base 2.at n=11A007088