6250
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 13
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 11718
- Proper Divisor Sum (Aliquot Sum)
- 5468
- 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
- 2500
- Möbius Function
- 0
- Radical
- 10
- Omega Function (Ω)
- 6
- 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
- 124
- 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
- yes
- Carmichael Number
- no
Classification
- Even
- yes
- Odd
- no
Appears in sequences
- a(n) = 5^n + n^5.at n=5A001593
- a(n+1) = 1 + a( floor(n/1) ) + a( floor(n/2) ) + ... + a( floor(n/n) ).at n=35A003318
- Numbers that are the sum of 2 positive 5th powers.at n=14A003347
- Numbers of the form 2^i*5^j with i, j >= 0.at n=43A003592
- Numbers that are the sum of at most 2 positive 5th powers.at n=20A004842
- If x and y are terms, so is x*y + 9.at n=37A009350
- a(n) = 2*n^n, n >= 2, otherwise a(n) = 1.at n=5A013499
- Triangle of coefficients in expansion of (2+5x)^n.at n=19A013621
- n is equal to the number of 3s in all numbers <= n written in base 5.at n=11A014895
- Positive integers n such that n | (2^n + n/2 + 1).at n=8A015945
- Numbers k such that k | 3^k + 1.at n=7A015949
- Numbers k such that k | 7^k + 1.at n=8A015954
- Numbers k such that k | 13^k + 1.at n=21A015963
- Numbers k such that the decimal expansion of k^2 contains k as a substring.at n=22A018834
- Numbers k such that the continued fraction for sqrt(k) has period 39.at n=5A020378
- Expansion of (1-3*x)/(1-5*x).at n=6A020699
- Pisot sequences E(2,10), L(2,10), P(2,10), T(2,10).at n=5A020729
- Positive numbers k such that k = x^5 + y^5 has a solution in nonzero integers x, y.at n=25A020896
- Least k>1 such that first n terms of Kolakoski sequence A000002 repeat in reverse order beginning at k-th term.at n=31A022295
- Ordered sequence of distinct terms of the form floor(x^i * floor(x^j)), i,j >= 0, where x = sqrt(5).at n=30A022770