Properties of the Number 81987

Eighty-One Thousand Nine Hundred Eighty-Seven

Basics

Value: 81986 → 81987 → 81988

Parity: odd

Prime: No

Previous Prime: 81973

Next Prime: 82003

Digit Sum: 33

Digital Root: 6

Palindrome: No

Factorization: 3 × 27329

Divisors: 1, 3, 27329, 81987

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10100000001000011

Octal: 240103

Duodecimal: 3B543

Hexadecimal: 14043

Square: 6721868169

Square Root: 286.33372138118835

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

Number of partially labeled rooted trees with n nodes (3 of which are labeled). A444

Numbers k such that 61·2^k-1 is prime. A50556

a(n) = {A081982(n)+1}/d, where d is the product of nonzero digits of A081982(n). A81987