Properties of the Number -218

Two Hundred Eighteen

Basics

Value: -219 → -218 → -217

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 2 × 109

Divisors: 1, 2, 109, 218

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -11011010

Octal: -332

Duodecimal: -162

Hexadecimal: -da

Square: 47524

Square Root: 14.7648230602334

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

Numbers k in pairs (j,k), with j <> k +- 1, such that the sum of their cubes is equal to a centered cube number. A352136

Smallest term in wrecker ball sequence starting with n. A248952

Triangle, read by rows of n² terms, where row n equals the coefficients in the series reversion of the function G(y,n)-1 such that: y = ∑_m>=1 1/G(y,n)^2·n*m * ∏_k=1..m (1 - 1/G(y,n)^2·k-1). A214690

Partial alternating sums of the sum of unitary divisors function (A034448). A370898

G.f. A(x) satisfies: A(x) = A(x² - x³)/x. A273218

Triangle of coefficients of Gaussian polynomials [2n+5,5]_q represented as finite sum of terms (1+q²)^k*q^g-k, where k = 0,1,...,g with g=5n. A267485

Triangle of coefficients of Gaussian polynomials [2n+7,6]_q represented as finite sum of terms (1+q²)^k*q^g-k, where k = 0,1,...,g with g=6n+3. A267486

Partial alternating sums of the sum of the bi-unitary divisors function (A188999). A370904

Sum(μ(i)*φ(j): i+j=n), with μ=A008683 and φ=A000010. A112962

Triangle read by rows of coefficients of polynomials generated by the Han/Nekrasov-Okounkov formula. A234937