Properties of the Number -161865

One Hundred Sixty-One Thousand Eight Hundred Sixty-Five

Basics

Value: -161866 → -161865 → -161864

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ³ × 5 × 11 × 109

Divisors: 1, 3, 5, 9, 11, 15, 27, 33, 45, 55

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -100111100001001001

Octal: -474111

Duodecimal: -79809

Hexadecimal: -27849

Square: 26200278225

Square Root: 402.3244958985222

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

a(n) = ∑_{k=0..floor(n/2)} binomial(k+3,3) * binomial(2·k,2·n-4·k). A382495

a(n) = n*(2·n + 1)*(4·n + 1). A316224

Number of pairs (c, y) where c is an integer composition and y is an integer partition and y can be obtained from c by choosing a partition of each part, flattening, and sorting. A318567

Let a(0)=1. Then a(n) = sums of consecutive strings of positive integers of length 3·n, starting with the integer 2. A289721

n = k² - (reversal of k)² for two different values of k. A87672