11621
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
- 11622
- 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
- 11620
- Möbius Function
- -1
- Radical
- 11621
- 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
- 50
- 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
- no
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 1398
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Position reached by frog in A038029. A038026(A038029(n)).at n=45A038031
- Primes p having exactly one partition into distinct divisors of p+1.at n=32A085499
- Primes p such that the next prime after p can be obtained from p by adding the product of the digits of p.at n=8A089823
- Primes with digital product = 12.at n=11A107697
- Primes such that the sum of the predecessor and successor primes is divisible by 31.at n=33A113155
- Records in A034694.at n=19A120856
- Primes which are the sum of the first k nonprimes for some k >= 2.at n=16A128927
- Prime numbers k such that k^2 +- (k+1) are primes.at n=31A137460
- Primes of the form 210n+71.at n=28A140856
- Primes congruent to 18 mod 41.at n=32A142215
- Primes congruent to 11 mod 43.at n=36A142260
- Primes congruent to 12 mod 47.at n=30A142363
- Primes congruent to 8 mod 49.at n=34A142420
- Primes congruent to 14 mod 53.at n=26A142544
- Primes congruent to 16 mod 55.at n=33A142612
- Primes congruent to 50 mod 57.at n=38A142696
- Primes congruent to 57 mod 59.at n=24A142784
- Primes congruent to 31 mod 61.at n=27A142829
- Primes congruent to 29 mod 63.at n=38A142905
- Primes congruent to 37 mod 64.at n=43A142941