7111
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 10
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 7672
- Proper Divisor Sum (Aliquot Sum)
- 561
- 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
- 6552
- Möbius Function
- 1
- Radical
- 7111
- 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
- 150
- 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
- Pseudoprimes to base 40.at n=26A020168
- Strong pseudoprimes to base 40.at n=10A020266
- Numbers k such that the continued fraction for sqrt(k) has period 72.at n=24A020411
- a(n) = n*(21*n + 1)/2.at n=26A022279
- Describe the previous term! (method B - initial term is 7).at n=2A022503
- Least k such that k and 4k are anagrams in base n (written in base 10).at n=35A023096
- Numbers whose product of digits is prime.at n=39A028842
- a(0) = 0; for n>0, a(n) is the smallest number greater than a(n-1) which does not use any digit used by a(n-1).at n=33A030283
- Numbers with multiplicative digital root value 7.at n=9A034054
- Shifts left under transform T where Ta is (identity) DCONV a.at n=34A038046
- Numbers having three 1's in base 10.at n=33A043495
- a(n) = least odd number which can be represented in the form p + 2*k^2, k>0, in n different ways.at n=41A060004
- Nearest integer to (n+1)^3/9.at n=39A060999
- a(n) = floor(n^3/9).at n=40A061263
- Numbers n such that A068861(n) = n.at n=28A068862
- a(n) is the next available entirely straight or curved number, depending on whether n contains a straight digit or not.at n=34A079064
- Number of squares on infinite quarter chessboard at <=n knight moves from the corner.at n=45A098500
- Lexicographically earliest increasing sequence of composite numbers such that the digits of a(n) do not appear in a(n-1).at n=27A100373
- Near-repunit semiprimes.at n=21A105993
- Lucky numbers for which the product of the digits is also a lucky number.at n=48A118556