11423
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 11
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 11424
- 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
- 11422
- Möbius Function
- -1
- Radical
- 11423
- 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
- 55
- 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
- 1378
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Primes that remain prime through 3 iterations of function f(x) = 5x + 4.at n=22A023284
- Primes that remain prime through 4 iterations of function f(x) = 5x + 4.at n=7A023314
- Primes of the form n*phi(n)-1 where phi is the Euler function (in order of appearance).at n=44A046078
- 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=39A073609
- Safe primes (A005385) (p and (p-1)/2 are primes) such that 6*p+1 is also prime.at n=34A075705
- Safe primes (A005385) (p and (p-1)/2 are primes) such that 12*p+1 is also prime.at n=31A075707
- Partial sums of A080180.at n=21A080181
- Primes whose decimal representation is a valid number in base 5 and interpreted as such is again a prime.at n=23A090708
- Primes with maximal digit = 4.at n=41A106098
- Primes of the form prime(n+1)*prime(n+3) - prime(n)*prime(n+2) - 1, ordered by n.at n=38A118624
- Prime sums of 5 positive 5th powers.at n=31A123034
- Primes p that divide Fibonacci[(p+1)/7].at n=19A125252
- List of triples of primes with common difference 12.at n=23A128312
- Weak Goodstein sequence starting at 11.at n=38A137411
- Primes of the form 3x^2+455y^2.at n=39A140015
- Primes of the form 2*3*5*7*n+83.at n=27A141570
- Primes congruent to 27 mod 37.at n=34A142136
- Primes congruent to 25 mod 41.at n=32A142222
- Primes congruent to 28 mod 43.at n=36A142277
- Primes congruent to 2 mod 47.at n=25A142355