12511
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 10
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 12512
- 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
- 12510
- Möbius Function
- -1
- Radical
- 12511
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 112
- 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
- 1494
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 90 ones.at n=4A031858
- Positive numbers for which the sum of digits equals the product of digits.at n=43A034710
- Each permutation in the list A060117 converted to Site Swap notation, with "zero throws" (fixed elements) replaced with n, the length of siteswap.at n=37A060495
- Primes p such that (x1*x2*...*xk)^(x1+x2+...+xk) = (x1+x2+...+xk)^(x1*x2*...*xk) where x1x2...xk are the digits of p in base 10.at n=9A064157
- Prime numbers such that sum of digits equals product of digits.at n=8A066306
- Primes which can be expressed as concatenation of cubes.at n=32A066592
- Primes which can be expressed as concatenation of powers of 5 and 0's.at n=18A066596
- Primes with digital product = 10.at n=3A107696
- Numbers n such that frac((floor((Pi*(n))))^(1/3))=0.at n=4A109343
- sigma(n) plus the n-th prime gives a square.at n=45A114082
- Number of free hexagonal polygons of symmetry class D_(2h) and area n.at n=30A121211
- Primes in A128490.at n=19A128491
- Number of isomorphism classes of 8-regular loopless multigraphs of order n.at n=6A129426
- Prime numbers of the form 24*p + 7 where p is prime.at n=38A135985
- Numbers k such that k and k^2 use only the digits 1, 2, 3, 5 and 6.at n=41A136974
- Numbers k such that k and k^2 use only the digits 1, 2, 4, 5 and 6.at n=50A136988
- Numbers k such that k and k^2 use only the digits 1, 2, 5 and 6.at n=13A137003
- Numbers k such that k and k^2 use only the digits 1, 2, 5, 6 and 7.at n=35A137004
- Numbers k such that k and k^2 use only the digits 1, 2, 5, 6 and 8.at n=23A137005
- Numbers k such that k and k^2 use only the digits 1, 2, 5, 6 and 9.at n=21A137006