11325
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 12
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 18848
- Proper Divisor Sum (Aliquot Sum)
- 7523
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 6000
- Möbius Function
- 0
- Radical
- 2265
- Omega Function (Ω)
- 4
- 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
- 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
- 37
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- 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
- a(n) = p*(p-1)/2 for p = prime(n).at n=35A008837
- Numbers k that divide s(k), where s(1)=1, s(j)=21*s(j-1)+j.at n=31A014872
- Powers of fifth root of 5 rounded to nearest integer.at n=29A018127
- Powers of fifth root of 5 rounded up.at n=29A018128
- a(n) = (2*n-1)*(4*n-1).at n=38A033567
- Triangular numbers that have some nontrivial permutation of digits which is also triangular.at n=38A034291
- Numbers whose base-5 representation contains exactly three 0's and three 3's.at n=8A045202
- Numbers n such that n | 9^n + 8^n + 7^n + 6^n.at n=48A057242
- Triangle T(n,k) of number of unilaterally connected digraphs on n unlabeled nodes with k arcs, k=0..n*(n-1).at n=54A057270
- Number of singular points on n-th order Chmutov surface.at n=30A057870
- a(n) = 49*(n*(n+1)/2) + 6.at n=21A061792
- Smallest triangular numbers that contain the digits of n anywhere in their middle.at n=13A062829
- Triangular numbers which are a concatenation of two or more positive triangular numbers.at n=22A068144
- Triangular numbers in which the k-th significant digit either divides k or is a multiple of k.at n=22A069559
- Smallest multiple of (n+1)-st prime which is == 1 mod n-th prime.at n=34A073604
- Products of members of pairs in A075333.at n=25A075337
- Triangular numbers which are 4-almost primes.at n=41A076578
- Triangular numbers whose external digits form a triangular number. Or triangular number whose MSD and LSD form a triangular number.at n=46A077367
- Triangular number pertaining to A081974. a(n) = A081974(n)*A081974(n+1).at n=40A081975
- a(n) = p(n)*(p(n)-1)/2 where p(n) = upper member of n-th pair of twin primes.at n=11A082669