5241
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 12
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 6992
- Proper Divisor Sum (Aliquot Sum)
- 1751
- 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
- 3492
- Möbius Function
- 1
- Radical
- 5241
- 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
- 85
- 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
- a(0) = 1, a(n) = 31*n^2 + 2 for n>0.at n=13A010020
- n written in fractional base 8/5.at n=33A024647
- T(2n+1,n+3), T given by A026747.at n=5A026867
- Squarefree n such that Q(sqrt(n)) has class number 5.at n=39A029705
- 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 48.at n=17A031546
- Numbers k such that A068340(k) = +/-5.at n=3A077033
- Starting positions of strings of three 7's in the decimal expansion of Pi.at n=3A083631
- Starting positions of strings of four 7's in the decimal expansion of Pi.at n=1A083632
- Successively larger 3-ball ground-state site swaps of A084501 in concatenated decimal notation.at n=22A084502
- Successively larger 3-ball indecomposable ground-state site swaps of A084511 in concatenated decimal notation.at n=8A084512
- Successively larger 3-ball 'prime' ground-state site swaps of A084521 in concatenated decimal notation.at n=7A084522
- Counts where both the odd composites (starting from 1) 1 mod 4 and 3 mod 4 are equal.at n=1A093182
- Fundamental discriminants of real quadratic number fields with class number 5.at n=23A094614
- Least odd k such that (k*2^n)^2+k*2^n-1 is the first of twin primes with n>0.at n=49A117637
- Triangle, read by rows of 2n+1 terms, where T(n,k) = T(n,k-1) + T(n-1,k-2) for n>0, 1<k<=2n, with T(n,1)=T(n,0)=T(n-1,2n-2) for n>0 and T(0,0)=1.at n=53A132427
- Total number of restricted right truncatable primes in base n.at n=28A133757
- Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (0, 0, -1), (0, 1, 1), (1, 0, 1), (1, 1, 0)}.at n=6A151196
- Values of k arising in A160518: numbers k such that (2*k^3 - 1, 2*k^3 + 1) are twin primes.at n=44A151612
- Records in A152770.at n=47A152911
- Exactly 10 consecutive odd integers starting with n are composite.at n=22A162023