Properties of the Number 81330

Eighty-One Thousand Three Hundred Thirty

Basics

Value: 81329 → 81330 → 81331

Parity: even

Prime: No

Previous Prime: 81307

Next Prime: 81331

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 2 × 3 × 5 × 2711

Divisors: 1, 2, 3, 5, 6, 10, 15, 30, 2711, 5422

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 10011110110110010

Octal: 236662

Duodecimal: 3B096

Hexadecimal: 13db2

Square: 6614568900

Square Root: 285.18415103227596

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

Triangle T(n,k), 0 <= k <= n, read by rows, defined by: T(0,0) = 1, T(n,k) = 0 if n<k, T(n,0) = T(n-1,0) + T(n-1,1) and for k >= 1: T(n,k) = T(n-1,k-1) + x·T(n-1,k) + T(n-1,k+1) with x = 3. A110877

Number of binary words of length n containing at least one subword 100001 and no subwords 10ⁱ1 with i<4. A143284

Irregular triangle read by rows: normalized dimensions of certain generalized quadratic residue codes of length n. A287879

Numbers that can be written as sum of two 3-smooth numbers. A81330

Number of (n+1)X5 binary arrays with every 2X2 subblock determinant equal to exactly one or two horizontal and vertical neighbor 2X2 subblock determinants. A186897