Properties of the Number 28661

Twenty-Eight Thousand Six Hundred Sixty-One

Basics

Value: 28660 → 28661 → 28662

Parity: odd

Prime: Yes

Previous Prime: 28657

Next Prime: 28663

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 28661

Divisors: 1, 28661

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 110111111110101

Octal: 67765

Duodecimal: 14705

Hexadecimal: 6ff5

Square: 821452921

Square Root: 169.29559947027565

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

T(n,k) = Hilltop maps: number of nXk binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or vertical neighbor in a random 0..1 n X k array. A218354

Primes of form n² + 28561. A256841

a(n) = Fibonacci(n) + 4. A157727

Number of n X n binary matrices with every 1 vertically or horizontally adjacent to some 0. A133515

Boustrophedon primes: write the numbers 0, 1, 2, 3, ... in a triangle on a square grid in the boustrophedon manner, ending a row when a prime is reached; sequence lists primes that appear in the zeroth column. A330339

Primes which remain prime after one and after two applications of the rotate-and-add operation of A086002. A86003

Next prime after n-th Fibonacci number. A14208

Primes that remain prime through 3 iterations of function f(x) = 3x + 8. A23279

Primes by index in A001945. A104499

Hilltop maps: number of nX4 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or vertical neighbor in a random 0..1 nX4 array. A218350