11939
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 23
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 11940
- 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
- 11938
- Möbius Function
- -1
- Radical
- 11939
- 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
- 94
- 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
- yes
- Mersenne Prime
- no
- Sophie Germain Prime
- yes
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 1431
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- The smallest representative in a cycle of circular primes, where circular primes are numbers that remain prime under cyclic shifts of digits.at n=15A016114
- Primes p such that x^47 = 2 has no solution mod p.at n=32A059257
- Denoting 5 consecutive primes by p, q, r, s and t, these are the values of q such that q, r and s have 10 as a primitive root, but p and t do not.at n=24A060261
- Geometric mean of the digits = 3. In other words, the product of the digits is = 3^k where k is the number of digits.at n=31A061427
- Primes which, although they have correct parity, are not in the prime number maze.at n=23A065123
- Numbers such that every cyclic permutation is a prime.at n=33A068652
- Primes in A058633.at n=40A080822
- Smallest member of a pair of consecutive twin prime pairs that have two primes between them.at n=34A089634
- Let n range through the odd numbers skipping multiples of 5; a(n) = n-th prime ending in n.at n=15A089779
- Lower bound twin primes such that their digital reverse is prime and a lower bound twin prime.at n=23A101783
- a(n) = round(10000*log(n/10)).at n=32A104077
- Primes p such that p's set of distinct digits is {1,3,9}.at n=24A108383
- Integers i such that 10*i XOR 11*i = 21*i.at n=37A115829
- Sophie Germain primes for which the reversal is also a Sophie Germain prime.at n=14A118573
- Primes congruent to 8 mod 41.at n=37A142205
- Primes congruent to 28 mod 43.at n=38A142277
- Primes congruent to 32 mod 49.at n=34A142441
- Primes congruent to 5 mod 51.at n=38A142479
- Primes congruent to 14 mod 53.at n=28A142544
- Primes congruent to 4 mod 55.at n=39A142604