Properties of the Number 8561

Eight Thousand Five Hundred Sixty-One

Basics

Value: 8560 → 8561 → 8562

Parity: odd

Prime: No

Previous Prime: 8543

Next Prime: 8563

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 7 × 1223

Divisors: 1, 7, 1223, 8561

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 10000101110001

Octal: 20561

Duodecimal: 4B55

Hexadecimal: 2171

Square: 73290721

Square Root: 92.52567211320326

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

Main diagonal of array in A358304, divided by 2. A358307

Numbers n such that the decimal number concat(2,n) is a square. A273357

Expansion of 1 / ((1-x)²*(1-x²)*(1-x³)*...*(1-x⁷)). A288342

Number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 113", based on the 5-celled von Neumann neighborhood. A270177

If, for some m, A098550(m-2) is a prime p and A098550(m) = 7p, add 7p to the sequence. A253054

Indices of prime Padovan numbers: values of k such that A000931(k+5) is prime. A112882

Positions in π where the leader in the race of digits changes. A361434

Integers whose sixth power contains exactly the same digits as another sixth power. A373192

Numbers k such that the continued fraction for sqrt(k) has period 80. A20419

a(n) = floor ( n(n+1)(n+2)(n+3) / (n+(n+1)+(n+2)+(n+3)) ). A32767