Properties of the Number 72561

Seventy-Two Thousand Five Hundred Sixty-One

Basics

Value: 72560 → 72561 → 72562

Parity: odd

Prime: No

Previous Prime: 72559

Next Prime: 72577

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 19 ² × 67

Divisors: 1, 3, 19, 57, 67, 201, 361, 1083, 1273, 3819

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10001101101110001

Octal: 215561

Duodecimal: 35BA9

Hexadecimal: 11b71

Square: 5265098721

Square Root: 269.37149069639867

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

G.f. A(x) satisfies: A(x) = (1-x) * ∑_n>=0 xⁿ / (1 - x·A(x)ⁿ). A340361

Numbers k such that k² +- k +- 1 is prime for all four possibilities. A236056

Denominators of w(n) equals 3 where w(1)=w(2)=w(3)=1, w(n)=(w(n-1)*w(n-2)+(w(n-1)+w(n-2))/3) / w(n-3). A72561