5129
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 17
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 5376
- Proper Divisor Sum (Aliquot Sum)
- 247
- 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
- 4884
- Möbius Function
- 1
- Radical
- 5129
- 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
- 147
- 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(n) = round(1000*log_2(n)).at n=34A004266
- Coordination sequence T1 for Zeolite Code DOH.at n=44A008078
- a(n) = floor(n*(n-1)*(n-2)/7).at n=34A011889
- Numbers k such that the continued fraction for sqrt(k) has period 58.at n=31A020397
- (d(n)-r(n))/5, where d = A026066 and r is the periodic sequence with fundamental period (0,3,1,0,1).at n=41A026068
- Numbers having period-1 7-digitized sequences.at n=26A031201
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 32 ones.at n=27A031800
- Number of partitions satisfying (cn(2,5) = cn(3,5) and cn(0,5) <= cn(1,5) and cn(0,5) <= cn(4,5)).at n=42A036805
- Denominators of continued fraction convergents to sqrt(376).at n=11A041713
- a(n)=T(n,n+1), array T as in A049735.at n=28A049741
- Numbers n such that 87*2^n-1 is prime.at n=28A050569
- a(1)=0 a(2)=3 a(n+2)=(a(n+1)+a(n))/3 if (a(n+1)+a(n)==0 (mod 3)); a(n+2)=a(n+1)+a(n) otherwise.at n=55A069203
- Frobenius number of the numerical semigroup generated by 3 consecutive triangular numbers.at n=16A069755
- Least nontrivial multiple of the n-th prime beginning with 5.at n=47A078289
- Composite numbers k such that the continued fraction for k/m contains no 2 for any 1 <= m <= k.at n=16A082409
- Number of distinct products i*j*k with 1 <= i < j <= k <= n and j < n.at n=43A083508
- Semiprimes that are the sum of two positive cubes. Common terms of A003325 and A046315.at n=27A085366
- a(n) = least semiprime with factors not previously used containing integers 2n and 2n+1 as substrings.at n=11A086887
- Numbers which are the sum of two positive cubes and divisible by 23.at n=5A101806
- Numbers n such that (n!/n#)^2 + 1 is prime, where n# = primorial numbers (A034386).at n=21A108948