Properties of the Number 81218

Eighty-One Thousand Two Hundred Eighteen

Basics

Value: 81217 → 81218 → 81219

Parity: even

Prime: No

Previous Prime: 81203

Next Prime: 81223

Digit Sum: 20

Digital Root: 2

Palindrome: Yes

Factorization: 2 × 40609

Divisors: 1, 2, 40609, 81218

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 10011110101000010

Octal: 236502

Duodecimal: 3B002

Hexadecimal: 13d42

Square: 6596363524

Square Root: 284.98771903364536

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

Palindromes that are the sum of consecutive initial odd primes. A58847

Base 10 palindromes that start with 8. A43043

Triangle T, read by rows, where column k of T = column 0 of matrix power T^k+1 for k>0, with column 0 of T = unsigned column 0 of T^-1 (shifted). A152400

Greatest squarefree number not exceeding n-th prime power which is not prime. A81218