16529
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 23
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 16530
- 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
- 16528
- Möbius Function
- -1
- Radical
- 16529
- 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
- 141
- 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
- 1914
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Numbers k such that the continued fraction for sqrt(k) has period 89.at n=19A020428
- Differences between numbers k such that k and k+1 have the same sum of divisors.at n=23A054001
- The first of two consecutive primes with equal digital sums.at n=38A066540
- Prime numbers occurring at integer Pythagorean distance (radius) from 1 in Ulam square prime-spiral. Primes on axes are excluded.at n=27A078765
- Records in A118878.at n=10A119903
- Primes congruent to 32 mod 47.at n=39A142383
- Primes congruent to 16 mod 49.at n=40A142427
- Primes congruent to 46 mod 53.at n=34A142576
- Primes congruent to 9 mod 59.at n=35A142736
- Primes congruent to 59 mod 61.at n=33A142857
- Primes p of the form 4*k+1 for which s=26 is the least positive integer such that s*p-(floor(sqrt(s*p)))^2 is a square.at n=16A145050
- Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0010-1010-1111 pattern in any orientation.at n=16A146779
- Triangle read by rows: T(n,k) is the number of secondary structures of size n having k stacks of odd length (n>=0, k>=0).at n=57A202845
- Primes p such that p and p+18 are consecutive primes with equal digital sum.at n=37A209875
- a(n) = 6*n^3 - 263*n^2 + 3469*n - 12841.at n=30A218457
- Non-palindromic balanced primes in base 16.at n=15A256090
- Numbers k that end with ( sum of digits of k )^2.at n=22A270343
- Number of pairwise coprime strict compositions of n, where a singleton is always considered coprime.at n=46A337562
- Primes that can be constructed by concatenating two squares >= 4.at n=15A345314
- Prime numbersat n=1914