Properties of the Number 72181

Seventy-Two Thousand One Hundred Eighty-One

Basics

Value: 72180 → 72181 → 72182

Parity: odd

Prime: No

Previous Prime: 72173

Next Prime: 72211

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 19 × 29 × 131

Divisors: 1, 19, 29, 131, 551, 2489, 3799, 72181

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 10001100111110101

Octal: 214765

Duodecimal: 35931

Hexadecimal: 119f5

Square: 5210096761

Square Root: 268.6652191855135

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

Generalized Fibonacci numbers: a(n) = a(n-1) + 10·a(n-2). A15446

Main diagonal of generalized Fibonacci array A083856. A83859

T(n,k) = number of ways to place any number of 2 X 1 tiles of k distinguishable colors into an n X 1 grid; array read by descending antidiagonals, with n, k >= 1. A193376

a(1) = 1; for n >= 2, suppose a(n-1) = Product p_i^e_i and n = Product p_i^f_i, then a(n) = Product p_i^e_i*f_i. A72181

Array read by ascending antidiagonals. T(n, k) = J(k, n) where J are the Jacobsthal polynomials. A350470

T(n,k) = T(n-1,k) + k·T(n-2,k) for k >= 1 and n >= 3 with T(0,k) = 0 and T(1,k) = T(2,k) = 1 for all k >= 1; array T(n,k), read by descending antidiagonals, with n >= 0 and k >= 1. A172237