Properties of the Number 81231

Eighty-One Thousand Two Hundred Thirty-One

Basics

Value: 81230 → 81231 → 81232

Parity: odd

Prime: No

Previous Prime: 81223

Next Prime: 81233

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 27077

Divisors: 1, 3, 27077, 81231

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10011110101001111

Octal: 236517

Duodecimal: 3B013

Hexadecimal: 13d4f

Square: 6598475361

Square Root: 285.01052612140484

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 the least term in the periodic part of the continued fraction for sqrt(k) is 95. A31773

Numbers m such that A327566(m) = ∑_k=1..m isigma(k) is divisible by m, where isigma(k) is the sum of infinitary divisors of k (A049417). A326488

Number of irreducible polyhedral graphs with n faces. A6867

Reversed sum of the two previous terms, with a(1) = 1 and a(2) = 11. A350766

Let p = n-th prime of the form 4k+3, take smallest solution (x,y) to the Pellian equation x² - p·y² = 1 with·and y >= 1; sequence gives value of x. A81231