15051
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 12
- Digital Root
- 3
- Palindromic Number
- yes
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 20880
- Proper Divisor Sum (Aliquot Sum)
- 5829
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 9632
- Möbius Function
- -1
- Radical
- 15051
- Omega Function (Ω)
- 3
- Little Omega Function (ω)
- 3
Special
- Factorial
- no
- Catalan Number
- no
- Bell Number
- no
- Motzkin Number
- no
- Primorial
- no
Figurate Numbers
- Fibonacci Number
- no
- Triangular Number
- yes
- Perfect Square
- no
- Perfect Cube
- no
- Pentagonal Number
- no
- Hexagonal Number
- yes
- 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
- 208
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- yes
- Prime Power
- no
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Palindromic triangular numbers.at n=12A003098
- a(n) = (2*n+1)*(4*n+1).at n=43A014634
- Numbers k such that k | (3^k + 3).at n=17A015888
- Numbers k such that k | 12^k + 12.at n=26A015904
- Pseudoprimes to base 13.at n=39A020141
- Pseudoprimes to base 35.at n=32A020163
- Pseudoprimes to base 52.at n=40A020180
- Strong pseudoprimes to base 35.at n=7A020261
- Strong pseudoprimes to base 38.at n=16A020264
- Strong pseudoprimes to base 52.at n=13A020278
- Strong pseudoprimes to base 92.at n=25A020318
- Triangular numbers (A000217) with prime indices.at n=39A034953
- Odd triangular numbers with prime indices.at n=18A034954
- Composite numbers k, not a power of 2, such that the E(k) == 1 (mod k), where E(k) is the k-th Euler number (A000364).at n=39A035163
- Palindromic triangular numbers arising from A050721 and A083571.at n=4A050722
- Palindromic binomial coefficients C(n,k) for k >= 2.at n=19A051641
- Palindromic hexagonal numbers.at n=6A054969
- Triangular numbers whose digit reversal is also a triangular number.at n=20A061455
- Smallest palindromic multiple of n-th prime.at n=39A062888
- Numbers n such that Fibonacci(n) is not squarefree, but for all proper divisors k of n, Fibonacci(k) is squarefree.at n=32A065069