Properties of the Number 28909

Twenty-Eight Thousand Nine Hundred Nine

Basics

Value: 28908 → 28909 → 28910

Parity: odd

Prime: Yes

Previous Prime: 28901

Next Prime: 28921

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 28909

Divisors: 1, 28909

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111000011101101

Octal: 70355

Duodecimal: 14891

Hexadecimal: 70ed

Square: 835730281

Square Root: 170.02646852769718

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

Primes of form (prime(n)² + prime(n+1)²)/2. A93343

Primes that are palindromic in base 11. A29978

Values of n such that n² + 5 is a triangular number (A000217). A276599

Primes arising in A053782. A53872

Average of squares of successive primes: a(n) = (prime(n+1)² + prime(n)²)/2, with n >= 2. A75892

Primes of the form k² + 9. A138353

Greatest prime factor of prime(n+1)² + prime(n)². A69485

Numbers k such that the continued fraction for sqrt(k) has period 91. A20430

G.f.: A(x) = exp( ∑_n>=1 A179305(n)*xⁿ/n ), where A179305(n) = ∑_d∣n C(n,d)*σ(d). A179304

Primes p of the form penta(n)-3, where penta(n) is the n-th pentagonal number. A232537