Properties of the Number 2561

Two Thousand Five Hundred Sixty-One

Basics

Value: 2560 → 2561 → 2562

Parity: odd

Prime: No

Previous Prime: 2557

Next Prime: 2579

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 13 × 197

Divisors: 1, 13, 197, 2561

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101000000001

Octal: 5001

Duodecimal: 1595

Hexadecimal: a01

Square: 6558721

Square Root: 50.60632371551998

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

Numbers that are the sum of 11 positive 8th powers. A3389

Numbers that are the sum of 6 positive 9th powers. A3395

Number of totally transitive rooted trees with n nodes. A318185

a(n) = n*(7·n² - 1)/6. A4126

Triangle read by rows: T(n,0) = T(n,n) = 1 and for 0<k<n: T(n,k) = 2·T(n-1, k-1) + T(n-1,k). A119258

Positions of occurrences of the natural numbers as third subsequence in A100035. A100038

Odd positive integers a(n) such that for every odd integer m > 1 there exists a unique representation of m as a sum of the form a(l) + 2a(s). A145812

Numbers whose arithmetic derivative (A003415) is a primorial number (A002110) > 1. A327978

Numerators (left to right) of Leibniz's harmonic-like triangle. A137754

a(n) = n² + n + 11. A48058