Properties of the Number -151981

One Hundred Fifty-One Thousand Nine Hundred Eighty-One

Basics

Value: -151982 → -151981 → -151980

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 19 ² × 421

Divisors: 1, 19, 361, 421, 7999, 151981

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -100101000110101101

Octal: -450655

Duodecimal: -73B51

Hexadecimal: -251ad

Square: 23098224361

Square Root: 389.84740604498063

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 nXk 0..1 arrays avoiding 0 0 0 horizontally and 0 1 0 vertically. A207182

a(n) = AlexanderPolynomial[n] defined as Det[Transpose[S]-n S] where S is Kronecker Product of two 2 X 2 Seifert matrices {{-1, 1}, {0, -1}} [X] {{-1, 1}, {0, -1}} = {{1, -1, -1, 1}, {0, 1, 0, -1}, {0, 0, 1, -1}, {0, 0, 0, 1}}. A138849

Vertical moments of inertia of a unit lozenge tiling of the hexagon with side lengths n (see references for exact configuration). A374083

Number of n X 3 0..1 arrays avoiding 0 0 0 horizontally and 0 1 0 vertically. A207177

Number of 7Xn 0..1 arrays avoiding 0 0 0 horizontally and 0 1 0 vertically. A207186