7173
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 10374
- Proper Divisor Sum (Aliquot Sum)
- 3201
- 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
- 4776
- Möbius Function
- 0
- Radical
- 2391
- Omega Function (Ω)
- 3
- 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
- 119
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- 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
- Class numbers associated with terms of A001988.at n=22A001989
- Expansion of 1/((1-2*x)*(1-x-2*x^3)).at n=11A003478
- Numbers that are the sum of 12 positive 10th powers.at n=7A004812
- Largest number not the sum of distinct n-th-order polygonal numbers.at n=26A007419
- Juxtapose pairs of primes (starting at 1).at n=10A007794
- Numbers k such that the continued fraction for sqrt(k) has period 60.at n=33A020399
- Numbers k such that Fib(k) == -34 (mod k).at n=43A023169
- [ exp(6/17)*n! ].at n=6A030894
- Lucky numbers that are concatenations of n with n + 2.at n=8A032652
- Concatenate the n-th and (n+1)st prime.at n=19A045533
- The lexicographically last sequence of binary encodings of solutions satisfying the equation given in A059871.at n=12A059875
- a(1) = 4, a(n) = concatenation of two closest factors of a(n-1) whose product equals a(n-1) or if a(n-1) is a prime then the concatenation of 1 and a(n-1).at n=4A063380
- Number of balanced numbers > 2^(n-1) and <= 2^n.at n=36A078555
- Twin prime pairs concatenated in decimal representation.at n=7A095958
- Consider the family of multigraphs enriched by the species of cycles. Sequence gives the triangle read by rows giving coefficients of polynomials arising from enumeration of those multigraphs on n edges.at n=31A098283
- Triangular matchstick numbers in the class of prime numbers: sum of n-th and next n primes.at n=31A105720
- Start with 1057 and repeatedly reverse the digits and add 2 to get the next term.at n=16A120215
- Connell (5,3)-sum sequence (partial sums of the (5,3)-Connell sequence).at n=56A122795
- a(0) = 2, a(1) = 3, a(n) = 4 * a(n-1) - a(n-2).at n=7A144720
- Mix A091411 and its differences.at n=23A157217