11279
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 20
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 11280
- Proper Divisor Sum (Aliquot Sum)
- 1
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 11278
- Möbius Function
- -1
- Radical
- 11279
- 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
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 86
- 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
- no
- Safe Prime
- yes
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 1364
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Wagstaff numbers: numbers k such that (2^k + 1)/3 is prime.at n=26A000978
- Supersingular primes of the elliptic curve X_0 (11).at n=16A006962
- Square root of A030681.at n=26A030682
- Primes for which only three iterations of 'Prime plus its digit sum equals a prime' are possible.at n=4A048525
- Primes p such that (p-1)/2 and (p-3)/4 are also prime.at n=22A066179
- Numbers k such that 2^k + 1 has just two distinct prime factors.at n=46A066263
- a(0) = 2; a(n) for n > 0 is the smallest prime greater than a(n-1) that differs from a(n-1) by a square.at n=38A073609
- Numbers k such that 2^k + 1 is the product of two distinct primes.at n=44A073936
- Safe primes (A005385) (p and (p-1)/2 are primes) such that 12*p+1 is also prime.at n=30A075707
- Class 6- primes (for definition see A005109).at n=29A081425
- Numbers k such that 2^k + 1 is a semiprime.at n=45A092559
- a(n) = prime(Lucas(n)), Lucas numbers beginning at 2 (A000032).at n=15A094894
- Numbers k such that 4*10^k + 6*R_k - 3 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=25A099005
- Primes of the form 16*k-1 such that 4*k-1 and 8*k-1 are also primes.at n=12A101793
- Indices of prime Jacobsthal numbers.at n=27A107036
- Primes which are the sum of a twin prime pair - 1.at n=41A118072
- Primes of the form A124080 (10 times triangular numbers) +- 1.at n=45A124110
- Lesser of twin simili-primes of order 2.at n=40A126699
- Primes p such that p^3 +- (p+1) are primes.at n=16A137472
- Primes congruent to 26 mod 31.at n=43A142030