6899
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 32
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 6900
- Proper Divisor Sum (Aliquot Sum)
- 1
- 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
- 6898
- Möbius Function
- -1
- Radical
- 6899
- Omega Function (Ω)
- 1
- Little Omega Function (ω)
- 1
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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 150
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- yes
- Composite Number
- no
- Semiprime
- no
- Squarefree Number
- yes
- Prime Power
- yes
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- yes
- Safe Prime
- yes
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 887
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Primes p == 7, 19, 23 (mod 40) such that (p-1)/2 is also prime.at n=43A000353
- Numerators of approximations to e.at n=22A006258
- 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 83.at n=1A031581
- Upper prime of a difference of 16 between consecutive primes.at n=23A031935
- p, p+8 and p+12 are primes.at n=39A046141
- Primes that yield a different prime when rotated by 180 degrees.at n=26A048890
- Primes whose digits are composite; primes having only {4, 6, 8, 9} as digits.at n=11A051416
- Primes having only {0, 6, 8, 9} as digits.at n=5A053580
- A000013 / 2.at n=17A054538
- A000016 / 2.at n=16A054539
- Safe primes which are also Sophie Germain primes.at n=23A059455
- Primes p such that p^11 reversed is also prime.at n=29A059704
- Smallest prime > the n-th nontrivial power of a prime.at n=47A060846
- Primes at which sum of digits strictly increases.at n=19A061248
- Primes having only 0,4,6,8,9 as digits.at n=18A061372
- Sum of digits = 8 times number of digits.at n=15A061425
- Numbers k such that 20^k - 19^k is prime.at n=4A062586
- Smallest prime larger than square of n-th prime.at n=22A062772
- Numbers k such that d(k) + d(k+1) + d(k+2) = 8, where d(k) = A001223.at n=30A064026
- Smallest prime with digit sum n, or 0 if no such prime exists.at n=31A067180