Properties of the Number 2545

Two Thousand Five Hundred Forty-Five

Basics

Value: 2544 → 2545 → 2546

Parity: odd

Prime: No

Previous Prime: 2543

Next Prime: 2549

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 5 × 509

Divisors: 1, 5, 509, 2545

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100111110001

Octal: 4761

Duodecimal: 1581

Hexadecimal: 9f1

Square: 6477025

Square Root: 50.44799302251776

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

Total number of ON states after n generations of cellular automaton based on hexagons. A151723

Coordination sequence for (3,3,4) tiling of hyperbolic plane. A265071

Composite and every divisor (except 1) contains the digit 5. A62672

Number of disconnected 2-regular simple graphs on n vertices with girth at least 4. A185224

Triangular array T(n,k), read by rows: coefficients of strong divisibility sequence of polynomials p(1,x) = 1, p(2,x) = 1 + 3·x, p(n,x) = u·p(n-1,x) + v·p(n-2,x) for n >= 3, where u = p(2,x), v = 1 - x - x². A367208

Numbers k such that 6^k - 5^k-1 is prime. A93713

a(n) = n² + 5·n + 1. A82111

T(n,k)=Number of nXk 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 0 or 2 neighboring 1s. A297457

T(n,k)=Number of nXk 0..2 arrays with no element equal to any value at offset (-2,-2) (-1,0) or (-1,1) and new values introduced in order 0..2. A275131

a(n) is the sum of all divisors of the first n positive even numbers. A326124