5231
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
- 2
- Divisor Sum
- 5232
- 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
- 5230
- Möbius Function
- -1
- Radical
- 5231
- 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
- 129
- 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
- yes
- Mersenne Prime
- no
- Sophie Germain Prime
- yes
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 695
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Primes of the form 2*k^2 + 29.at n=44A007641
- Coordination sequence T3 for Zeolite Code EPI.at n=46A008092
- Coordination sequence T4 for Zeolite Code MFI.at n=46A008167
- Number of partitions of 2*n into at most 4 parts.at n=43A014126
- Number of triples of different integers from [ 2,n ] with no common factors between pairs.at n=47A015620
- Let q_k=p(p+2) be product of k-th pair of twin primes; sequence gives values of p such that (q_k)^2 > q_{k-i}q_{k+i} for all 1 <= i <= k-1.at n=35A021005
- Initial members of prime triples (p, p+2, p+6).at n=41A022004
- Primes that remain prime through 2 iterations of function f(x) = 6x + 1.at n=42A023256
- Primes that remain prime through 2 iterations of function f(x) = 8x + 1.at n=17A023260
- Primes that remain prime through 3 iterations of function f(x) = 9x + 8.at n=18A023298
- 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 71.at n=16A031569
- Primes of form x^2 + 94*y^2.at n=39A033204
- Positive numbers having the same set of digits in base 8 and base 9.at n=24A037441
- a(n)=(s(n)+2)/9, where s(n)=n-th base 9 palindrome that starts with 7.at n=34A043078
- Primes p such that p+2 and 2p+1 are also prime.at n=37A045536
- Primes with first digit 5.at n=42A045711
- a(n) = a(1) + a(2) + ... + a(n-1) + a(m) for n >= 4, where m = n - 1 - 2^p and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), with a(1) = a(2) = 1 and a(3) = 2.at n=13A049938
- Primes or negative values of primes in the sequence b(n) = 47*n^2 - 1701*n + 10181, n >= 0.at n=33A050267
- Primes q of the form q = 10p + 1, where p is also prime.at n=23A055781
- Primes p such that p^7 reversed is also prime.at n=35A059700