6251
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 14
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 7680
- Proper Divisor Sum (Aliquot Sum)
- 1429
- 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
- 4968
- Möbius Function
- -1
- Radical
- 6251
- Omega Function (Ω)
- 3
- Little Omega Function (ω)
- 3
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
- 111
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- 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
- Numbers that are the sum of 3 positive 5th powers.at n=30A003348
- Expansion of 1/((1-x)*(1-x-2*x^3)).at n=16A003479
- Cycle class sequence c(2n) (the number of true cycles of length 2n in which a certain node is included) for zeolite ATN = MAPO-39 Hn [ MgnAl8-n P8O32 ].at n=5A018983
- Least k>1 such that first n terms of Kolakoski sequence A000002 repeat in reverse order beginning at k-th term.at n=30A022295
- Numbers having four 0's in base 5.at n=24A043352
- 5-morphic but not bimorphic, automorphic nor trimorphic.at n=33A056036
- Numbers k such that k^4 == 1 (mod 5^4).at n=40A056091
- Numbers k such that k^4 == 1 (mod 5^5).at n=8A056102
- Sum of even-indexed primes.at n=36A077126
- Least positive integers, all distinct, that satisfy sum(n>0,1/a(n)^z)=0, where z=(60+I*11)/61.at n=29A084804
- Centered hexamorphic numbers: the k-th centered hexagonal number, 3k(k-1)+1, ends in k.at n=16A094534
- A Langford-like sequence.at n=36A108401
- Expansion of q^(-1) * f(-q^2, -q^5)^2 * f(-q^3, -q^4) / f(-q^1, -q^6)^3 in powers of q where f() is Ramanujan's two-variable theta function.at n=52A108481
- Number of partitions of n which, as multisets, are nontrivial repetitions of a multiset.at n=59A108572
- Number of 5-dimensional partitions of n up to conjugacy.at n=14A119340
- Start with the seed a(0)=2. The minimum number, different from 1, that multiplied by 2 (seed) produces a number with 2 as its rightmost digit is a(1)=6. Then 6*2=12. Again, the minimum number that multiplied by 12 produces 12 as its rightmost digits is a(2)=26 (12*26=312). And so on.at n=4A123872
- a(3n+k) = 3a(3n+k-1)-3a(3n+k-2)+2a(3n+k-3) for k = 0,1; a(3n+2) = 3a(3n-1)-3a(3n-2), with a(0) = 0,a(1) = 1,a(2) = 3.at n=16A132158
- Concatenation of first two digits and last two digits of n-th Mersenne prime A000668(n).at n=35A138863
- Odd squarefree numbers n such that the cyclotomic polynomial Phi(n,x) has height 4.at n=24A152942
- Products of 3 distinct non-Sophie Germain primes.at n=18A157347