7031
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 11
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 7200
- Proper Divisor Sum (Aliquot Sum)
- 169
- 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
- 6864
- Möbius Function
- 1
- Radical
- 7031
- 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
- Discriminants of quintic fields with 2 complex conjugates (negated).at n=4A023684
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 83.at n=16A031581
- Fibonacci iteration starting with (1, a(n)) leads to a "nine digits anagram".at n=11A034587
- a(n)=(s(n)+3)/10, where s(n)=n-th base 10 palindrome that starts with 7.at n=25A043086
- Centered 10-gonal numbers.at n=37A062786
- Semiprimes p1*p2 such that p2 mod p1 = 10, with p2 > p1.at n=39A064908
- Sum of even-indexed primes.at n=38A077126
- Constant term when a polynomial of degree n is fitted to the lower members of the first n+1 twin prime pairs.at n=10A082674
- a(n) = prime(n)*prime(n+2).at n=21A090076
- The sixth column of triangle A091492, excluding leading zeros.at n=44A091498
- 3-Smith numbers.at n=23A104391
- Odd numbers n for which 13 is the smallest i (>= 1) with Jacobi symbol J(i,n) getting either a value 0 or -1.at n=20A112076
- Triangle read by rows: T(n,k) is number of Motzkin paths of length n having k UH's, where U=(1,1), H=(1,0) (0<=k<=floor(n/3)).at n=31A114576
- a(n) = least k such that the remainder when 32^k is divided by k is n.at n=44A128372
- Partial sums of A151789.at n=47A151790
- a(n) = prime(n) times the n-th nonnegative noncomposite.at n=23A176098
- Least odd number k such that x' = k has n solutions, where x' is the arithmetic derivative (A003415) of x.at n=21A189560
- Numbers k such that tau(k-1) = (tau(k))^2 = tau(k+1), where tau(k) = A000005(k) (number of divisors of k).at n=25A190266
- Dispersion of (floor(2*n*sqrt(2))), by antidiagonals.at n=45A191540
- Dispersion of A016861, (5k+1), by antidiagonals.at n=22A191703