11015
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 8
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 13224
- Proper Divisor Sum (Aliquot Sum)
- 2209
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 8808
- Möbius Function
- 1
- Radical
- 11015
- Omega Function (Ω)
- 2
- Little Omega Function (ω)
- 2
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
- 68
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- yes
- 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
- Smallest m such that A051145(m) = 2^n.at n=21A051147
- Interprimes which are of the form s*prime, s=5.at n=25A075280
- Least non-balanced x (i.e., not in A020492) such that sigma(2n-1,x)/phi(x) is an integer.at n=29A078539
- Least non-balanced x (i.e., not in A020492) such that sigma(p(n),x)/phi(x) is an integer, where p(n) = n-th prime.at n=17A078540
- Numbers k such that k, k+2, k+4, k+6, k+8 are semiprimes.at n=36A092127
- Numbers beginning with a vowel in French.at n=17A118557
- Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-0100-1111 pattern in any orientation.at n=10A146651
- a(n) = 441*n^2 - 2*n.at n=4A157737
- a(n) = 324n - 1.at n=33A158306
- a(n) = 34*n^2 - 1.at n=17A158588
- Cyclops semiprimes.at n=27A160725
- Odd cyclops numbers.at n=47A162199
- Counting integers normally (1, 2, 3, 4, 5...), write them as roman numerals (I, II, III, IV, V...), describe them (one 1, two 1s, three 1s, one 1 one 5, one 5...), and write them out as numbers (11, 21, 31, 1115, 15...).at n=14A180105
- Numbers n with property that there is a different number m such that the lunar squares n*n and m*m are the same.at n=4A181319
- Number of zero-sum -7..7 arrays of n elements with first through third differences also in -7..7.at n=5A202510
- Number of zero-sum -n..n arrays of 6 elements with first through third differences also in -n..n.at n=6A202514
- Positions at which powers of 2 occur in A051145.at n=29A244747
- Number of degrees of irreducible representations of symmetric group S_n that appear more than once.at n=38A318558
- 1/(Integral_{x=0..1} x^(x^(x^n)) dx - 1/2), rounded to the nearest integer.at n=26A322009
- Number of ways to write n as an ordered sum of 5 nonprime numbers.at n=42A341482