6198
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 24
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 12408
- Proper Divisor Sum (Aliquot Sum)
- 6210
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- yes
Derived Values
- Euler's Totient
- 2064
- Möbius Function
- -1
- Radical
- 6198
- 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
- 137
- 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
- yes
- Odd
- no
Appears in sequences
- a(n) = 3 + n/2 + 7*n^2/2.at n=42A006124
- 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 78.at n=9A031576
- Number of partitions of n with equal nonzero number of parts congruent to each of 2 and 4 (mod 5).at n=42A035570
- a(n) = floor(log(n)*exp(n)).at n=7A058750
- Numbers which are the sum of their proper divisors containing the digit 0.at n=38A059461
- Least k such that k*12^n +/- 1 are twin primes.at n=42A064221
- Squarefree numbers sandwiched between a pair of twin primes.at n=44A070195
- This table shows the coefficients of sum formulas of n-th Fibonacci numbers (A000045). The k-th row (k>=1) contains T(i,k) for i=1 to k, where k=[2*n+1+(-1)^(n-1)]/4 and T(i,k) satisfies F(n)= Sum_{i=1..k} T(i,k) * n^(k-i)/(k-1)!.at n=47A099731
- Erroneous version of A005630.at n=13A100507
- Numbers k such that (10^(2*k+1) + 36*10^k - 1)/9 is prime.at n=9A107125
- Numbers k such that k^2-1 and k^2+1 are semiprimes.at n=44A108278
- Lesser of twin admirable numbers: k such that k and k+2 are both admirable numbers.at n=25A109730
- Admirable numbers in the middle of twin primes.at n=24A135502
- a(n) = 121*n^2 - 204*n + 86.at n=7A157440
- Averages of twin prime pairs which can be represented as a sum of three consecutive of such pair averages.at n=11A160917
- Averages of twin prime pairs that are sums of 4 consecutive averages of twin prime pairs.at n=13A160918
- a(n) = A161330(n)*3.at n=43A161333
- The isolated nonprimes that are the sum of two successive primes.at n=43A167597
- Numbers that are divisible by exactly 3 primes (counted with multiplicity) and sandwiched between primes.at n=23A171179
- Numbers k such that k^3 +-5 are primes.at n=27A176684