Properties of the Number 12561

Twelve Thousand Five Hundred Sixty-One

Basics

Value: 12560 → 12561 → 12562

Parity: odd

Prime: No

Previous Prime: 12553

Next Prime: 12569

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 53 × 79

Divisors: 1, 3, 53, 79, 159, 237, 4187, 12561

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11000100010001

Octal: 30421

Duodecimal: 7329

Hexadecimal: 3111

Square: 157778721

Square Root: 112.07586716149021

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 k such that σ(k) = σ(k+4). A15863

Numbers k such that σ(k) = σ(k+6). A15866

a(n) = (2·n-1)*(4·n-1). A33567

Triangular numbers which are the average of two consecutive primes. A130178

G.f. satisfies: A(x) = 1 + x·A(x)²/A(-x). A143339

Triangular numbers with property that digits alternate in parity. A68882

Triangular numbers that are products of three distinct primes. A128896

Divisors of 10¹³ - 1. A109933

Triangular numbers with sum of digits = 15. A68130

Triangular numbers with property that swapping first and last digits also gives a triangular number. A69708