Properties of the Number 81816

Eighty-One Thousand Eight Hundred Sixteen

Basics

Value: 81815 → 81816 → 81817

Parity: even

Prime: No

Previous Prime: 81799

Next Prime: 81817

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 2 ³ × 3 × 7 × 487

Divisors: 1, 2, 3, 4, 6, 7, 8, 12, 14, 21

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10011111110011000

Octal: 237630

Duodecimal: 3B420

Hexadecimal: 13f98

Square: 6693857856

Square Root: 286.03496289789473

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

T(n,k)=Number of length n+4 0..k arrays with no five consecutive terms having the maximum of any two terms equal to the minimum of the remaining three terms. A249844

Number of partitions of n into parts of 6 kinds. A23005

Nontrivial numbers k containing no zero digits which are divisible by the number formed by writing the digits of k in ascending order. A84687

Numbers k divisible by at least one nontrivial permutation (rearrangement) of the digits of k, excluding all permutations that result in digit loss. A90056

n times n+5 gives the concatenation of two numbers m and m-6. A116249

Primitive members of A084687. That is, members which cannot be generated by inserting digits into previous members in recognized patterns. A86083

Row sums of square of trinomial triangle A071675. A103780

Number of (n+1) X 4 0..1 arrays with the number of equal 2 X 2 subblock diagonal pairs and equal antidiagonal pairs differing from each horizontal or vertical neighbor, and new values 0..1 introduced in row major order. A205221

Number of length n+4 0..3 arrays with no five consecutive terms having the maximum of any two terms equal to the minimum of the remaining three terms. A249839

Number of length 6+4 0..n arrays with no five consecutive terms having the maximum of any two terms equal to the minimum of the remaining three terms. A249850