15091
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 16
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 15092
- 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
- 15090
- Möbius Function
- -1
- Radical
- 15091
- 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
- 71
- 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
- 1763
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Primes that remain prime through 3 iterations of function f(x) = 9x + 10.at n=40A023299
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 64 ones.at n=35A031832
- Numbers whose base-7 representation contains exactly four 6's.at n=7A043420
- Discriminants of imaginary quadratic fields with class number 19 (negated).at n=27A046016
- Primes for which only three iterations of 'Prime plus its digit sum equals a prime' are possible.at n=5A048525
- Primes of the form 30*p + 1 where p is also prime.at n=37A051646
- Fourth term of weak prime quintets: p(m-2)-p(m-3) < p(m-1)-p(m-2) < p(m)-p(m-1) < p(m+1)-p(m).at n=37A054826
- Primes p whose period of reciprocal equals (p-1)/5.at n=29A056210
- McKay-Thompson series of class 20B for Monster.at n=22A058551
- Arithmetic mean of largest subset of {A063676(1), ......., A063676(n-1)} such that a(n) is an integer and a(n) is maximal.at n=48A063678
- Number of inequivalent (ordered) solutions to n^2 = sum of 8 squares of integers >= 0.at n=38A065462
- Primes expressible as the sum of (at least two) consecutive primes in at least 3 ways.at n=27A067379
- Prime numbers which when written in base 7 have a composite digit-sum.at n=20A096790
- Expansion of 1/(1 - x - x^3 - x^5 - x^7).at n=22A117760
- Primes for which the weight as defined in A117078 is 11 and the gap as defined in A001223 is 10.at n=18A119596
- Prime numbers n such that n^2 +- (n-1) are primes.at n=36A137459
- Primes congruent to 41 mod 43.at n=35A142290
- Primes congruent to 4 mod 47.at n=34A142356
- Primes congruent to 39 mod 53.at n=37A142569
- Primes congruent to 46 mod 59.at n=28A142773