Properties of the Number 61281

Sixty-One Thousand Two Hundred Eighty-One

Basics

Value: 61280 → 61281 → 61282

Parity: odd

Prime: No

Previous Prime: 61261

Next Prime: 61283

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 11 × 619

Divisors: 1, 3, 9, 11, 33, 99, 619, 1857, 5571, 6809

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1110111101100001

Octal: 167541

Duodecimal: 2B569

Hexadecimal: ef61

Square: 3755360961

Square Root: 247.54999495051499

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

Irregular triangle in which row n has the values of k>n such that ∑_i=n..k i² is a square. A184763

a(n) = 100·n² - 49·n + 6. A157651

a(n) = number of subsets S of {1,2,...,n} having more than 2 elements such that (sum of least three elements of S) > max(S). A357289

Side of n-th equilateral triangle enclosing at least one point located at integer distances from the vertices. A61281