Properties of the Number 72261

Seventy-Two Thousand Two Hundred Sixty-One

Basics

Value: 72260 → 72261 → 72262

Parity: odd

Prime: No

Previous Prime: 72253

Next Prime: 72269

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 7 × 31 × 37

Divisors: 1, 3, 7, 9, 21, 31, 37, 63, 93, 111

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10001101001000101

Octal: 215105

Duodecimal: 35999

Hexadecimal: 11a45

Square: 5221652121

Square Root: 268.81406213217343

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 k and k² use only the digits 1, 2, 5, 6 and 7. A137004

Expansion of 1/((1-4x)(1-5x)(1-7x)(1-10x)). A28117

a(n) = 4·a(n-1) + 1, a(1)=7. A72261

Expansion of -((2·sqrt(1-4·x)-2)*x)/(sqrt(8·x+4·sqrt(1-4·x)-3)-1). A243764

Number of nX4 0..1 arrays with each 1 adjacent to 3, 4 or 5 king-move neighboring 1s. A296986