13669
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 25
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 13670
- 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
- 13668
- Möbius Function
- -1
- Radical
- 13669
- 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
- 58
- 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
- 1614
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Cuban primes: primes which are the difference of two consecutive cubes.at n=32A002407
- Primes that remain prime through 3 iterations of function f(x) = 4x + 3.at n=32A023281
- Primes that remain prime through 3 iterations of function f(x) = 10x + 3.at n=36A023300
- Upper prime of a difference of 20 between consecutive primes.at n=28A031939
- Numbers ending with '9' that are the difference of two positive cubes.at n=40A038864
- Numbers k such that 2^(k+1) - k - 2 is prime.at n=11A063791
- Fixed points when A001414 is iterated and started at factorials of prime numbers.at n=57A082086
- Primes p such that the sum of the digits of p is not prime, but the sum of the squares of the digits of p is prime.at n=20A091362
- Prime numbers which when written in base 7 have a composite digit-sum.at n=9A096790
- Primes of the form [prime(n)*prime(n+1)+p]/2 with increasing p.at n=35A100558
- Sum of n-th prime squared and n-th perfect square.at n=29A106587
- a(n) = A128022(n)/n.at n=18A128023
- Hex (or centered hexagonal) numbers that are prime powers of the form (6n+1)^k.at n=33A133323
- Primes in A136133 (integer log of harmonic numbers sequence).at n=5A136134
- Primes of the form 210k + 19.at n=36A140843
- Primes congruent to 16 mod 37.at n=42A142125
- Primes congruent to 16 mod 41.at n=35A142213
- Primes congruent to 38 mod 43.at n=36A142287
- Primes congruent to 39 mod 47.at n=33A142390
- Primes congruent to 47 mod 49.at n=37A142454