5213
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
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 5628
- Proper Divisor Sum (Aliquot Sum)
- 415
- 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
- 4800
- Möbius Function
- 1
- Radical
- 5213
- 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
- 103
- 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
- 5th powers written backwards.at n=5A002118
- Molien series of 4-dimensional representation of cyclic group of order 4 over GF(2) (not Cohen-Macaulay).at n=48A008610
- Numbers k such that the continued fraction for sqrt(k) has period 9.at n=29A010339
- Sum of the numbers between the two n's in A026362.at n=37A026365
- Positive numbers having the same set of digits in base 8 and base 10.at n=26A037442
- a(n)=(s(n)+2)/9, where s(n)=n-th base 9 palindrome that starts with 7.at n=32A043078
- a(n)=(s(n)+5)/10, where s(n)=n-th base 10 palindrome that starts with 5.at n=43A043084
- Numbers whose base-5 representation contains exactly two 1's and three 3's.at n=36A045243
- Largest number m with A046805(m) = n.at n=45A046806
- Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 5.at n=12A051970
- Numbers n such that n | 8^n + 7^n + 6^n + 5^n + 4^n + 3^n + 2^n + 1^n.at n=34A056751
- a(n) = n^n written backwards.at n=4A062018
- Dimension of the space of weight n cuspidal newforms for Gamma_1( 71 ).at n=25A063344
- Semiprimes p1*p2 such that p2 > p1 and p2 mod p1 = 11.at n=17A064909
- Powers of 5 written backwards.at n=5A071583
- Convolution of primes with partition numbers.at n=14A086717
- Expansion of g.f. x*(1-x)/(1-4*x-2*x^2+x^3).at n=6A100295
- Divisors of 100K, reversed.at n=26A101410
- Semiprimes whose digit reversal is a nontrivial power.at n=18A108849
- Semiprimes (A001358) whose digit reversal is a powerful(1) number (A001694).at n=20A115688