Properties of the Number 28251

Twenty-Eight Thousand Two Hundred Fifty-One

Basics

Value: 28250 → 28251 → 28252

Parity: odd

Prime: No

Previous Prime: 28229

Next Prime: 28277

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 43 × 73

Divisors: 1, 3, 9, 43, 73, 129, 219, 387, 657, 3139

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 110111001011011

Octal: 67133

Duodecimal: 14423

Hexadecimal: 6e5b

Square: 798119001

Square Root: 168.08033793397726

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)=Number of nXk 0..1 arrays with every element unequal to 1, 2, 3, 4 or 6 king-move adjacent elements, with upper left element zero. A304597

Numbers k such that A173557(k) = A173557(k+1). A333874

Numbers k such that k divides the sum of the digits of k^2k. A108859

Numbers k with property that 19·k + {2,4,8,10} are two pairs of consecutive twin primes. A152926

Number of nX4 0..1 arrays with every element unequal to 1, 2, 3, 4 or 6 king-move adjacent elements, with upper left element zero. A304593

Number of nX5 0..1 arrays with every element unequal to 1, 2, 3, 4 or 6 king-move adjacent elements, with upper left element zero. A304594

Numbers k such that s(k) = s(k+1), where s(k) is the unitary analog of the alternating sum-of-divisors function (A307037). A333408

Odd numbers divisible by 3 which are neither of the form p + 3^m + 1 nor of the form p + 3^m - 1 with p prime. A282191

Numbers k such that (13·10^k + 401)/9 is prime. A289811

G.f. satisfies: A(x) = 1 + x·A(x)³ + 2·x²*A(x)² + x³*A(x). A200028