Properties of the Number 28081

Twenty-Eight Thousand Eighty-One

Basics

Value: 28080 → 28081 → 28082

Parity: odd

Prime: Yes

Previous Prime: 28069

Next Prime: 28087

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 28081

Divisors: 1, 28081

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110110110110001

Octal: 66661

Duodecimal: 14301

Hexadecimal: 6db1

Square: 788542561

Square Root: 167.57386431063765

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 the form 2·n²+6·n+1. A176549

T(n,k)=Number of nXk 0..1 arrays avoiding 0 0 0 horizontally and 0 1 1 vertically. A206936

Numbers whose least quadratic nonresidue (A020649) is 17. A25026

Primes p such that A001175(p) = (p-1)/9. A308794

Centered 36-gonal numbers. A195316

Place n points in general position on each side of a square, and join every pair of the 4·n+4 boundary points by a chord; sequence gives number of regions in the resulting planar graph. A367121

Primes p such that there exist three primes q, r and s with p³=q³+r³+s³. A114923

Primes corresponding to terms of A248145. A248146

Lesser of consecutive primes whose sum is of the form k*(k+2), for some integer k. A242384

Table read by antidiagonals: Place k points in general position on each side of a regular n-gon and join every pair of the n*(k+1) boundary points by a chord; T(n,k) (n >= 3, k >= 0) gives number of regions in the resulting planar graph. A366253