13249
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 13250
- 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
- 13248
- Möbius Function
- -1
- Radical
- 13249
- 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
- 76
- 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
- 1575
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Number of unrooted hexagonal polyominoes with n cells and no reflections allowed.at n=9A002214
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 82 ones.at n=9A031850
- Denominators of continued fraction convergents to sqrt(236).at n=10A041441
- Denominators of continued fraction convergents to sqrt(944).at n=14A042827
- Least prime in A031928 (lesser of 10-twins) whose distance to the next 10-twin is 6*n.at n=30A052354
- P(p(n)), P = primes (A000040), p = partition numbers (A000041).at n=24A058697
- Number of partitions of n into Lucas parts (A000032).at n=60A067593
- a(n)=A074639(A074647(n)).at n=40A074648
- Smallest prime of the form 1 followed by a perfect power.at n=13A089773
- a(n) is the largest prime factor of 2^n + 3^n.at n=22A094474
- a(n) = floor(11^n/7^n).at n=21A094993
- a(n) = n^3 - n^2 + 1.at n=24A100104
- Primes of the form 128n+65.at n=27A105129
- Maximal troughs in decimal expansions of Pi: positions of troughs equal to 8.at n=18A105276
- Primes for which the level is equal to 9 in A117563.at n=33A118481
- Mother primes of order 11.at n=23A136070
- Primes of the form x^2 + 1320*y^2.at n=36A139666
- Primes of the form 76x^2+20xy+145y^2.at n=24A140629
- Primes of the form 210k + 19.at n=35A140843
- Primes congruent to 6 mod 41.at n=41A142203