15269
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
- 2
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 15270
- 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
- 15268
- Möbius Function
- -1
- Radical
- 15269
- 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
- 84
- 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
- 1782
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Numbers k such that the continued fraction for sqrt(k) has period 89.at n=18A020428
- Schoenheim bound L_1(n,9,8).at n=11A036836
- Primes whose consecutive digits differ by 3 or 4.at n=33A048415
- Primes p whose period of reciprocal equals (p-1)/11.at n=4A056216
- Numbers k such that sigma(phi(sigma(k))) = phi(sigma(phi(k))).at n=14A067160
- Near twin primes of order 18: twin primes (p, p+2) such that p+18 and p+20 are primes.at n=25A079304
- Primes arising in A085042: a(n) = the n-th partial sum of A085042.at n=28A085043
- Lessers of twin prime pairs whose greater has a prime prime index.at n=41A094068
- Value of C in y = x^2+7x+C such that y is prime for all x = 0 to 4.at n=23A097436
- Duplicate of A056216.at n=4A098678
- Smallest prime equal to the sum of n distinct squares.at n=33A100559
- Primes p such that p+2, p*(p+2) + 12 and p*(p+2) + 14 are also prime.at n=1A130736
- Primes congruent to 41 mod 47.at n=40A142392
- Primes congruent to 5 mod 53.at n=33A142535
- Primes congruent to 47 mod 59.at n=32A142774
- Primes congruent to 19 mod 61.at n=28A142817
- Expansion of 1/(1 - x*(1 - 11*x)).at n=10A146083
- Sophie Germain primes in A154939.at n=20A154941
- Let m = A002445(n); then a(n) = largest member of A001359 (the lesser twin primes sequence) <= m.at n=21A156053
- Primes p such that p^3 + p^2 - 1 and p^3 + p^2 + 1 are prime.at n=38A160859