7109
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 17
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 7110
- Proper Divisor Sum (Aliquot Sum)
- 1
- 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
- 7108
- Möbius Function
- -1
- Radical
- 7109
- Omega Function (Ω)
- 1
- Little Omega Function (ω)
- 1
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
- 119
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- yes
- Composite Number
- no
- Semiprime
- no
- Squarefree Number
- yes
- Prime Power
- yes
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 911
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Numbers k such that the continued fraction for sqrt(k) has period 27.at n=32A020366
- Primes that are palindromic in base 6.at n=24A029974
- Numbers in which all pairs of consecutive base-6 digits differ by 3.at n=24A033077
- Base-6 palindromes that start with 5.at n=31A043014
- Primes with first digit 7.at n=28A045713
- Number of two-rowed partitions of length 4.at n=26A070557
- Take A000040, omit commas: 23571113171923..., select 4-digit primes seen when scanning from left.at n=8A073037
- Take A000040, omit commas: 23571113171923..., select 5-digit primes seen when scanning from left.at n=10A073038
- Expansion of (1-x)^(-1)/(1 - 2*x - 2*x^3).at n=10A077851
- a(n) = prime(k) where k = n-th prime congruent to 1 mod 10.at n=36A078656
- Largest number k such that the interval [k^2,(k+1)^2] contains not more than n pairs of twin primes.at n=40A099154
- Prime numbers p such that pi(p) + 2*p is a square.at n=11A104783
- Primes of the form p^3 + q^3 + r^3, where p, q and r are primes.at n=18A123597
- Primes p such that p^3 is a sum of three successive primes, or primes in A076306(n).at n=36A123984
- Primes of the form p = prime(k+1) such that prime(k) = (prime(k+3)+prime(k-1))/2.at n=10A126239
- Floor of sum of the first n^2 square roots.at n=22A138357
- Primes of the form 29x^2+2xy+29y^2.at n=31A139997
- Primes of the form 5x^2+264y^2.at n=30A140001
- Primes of the form 21x^2+65y^2.at n=29A140023
- Primes of the form 44x^2+44xy+53y^2.at n=32A140042