Properties of the Number -1685

Six Hundred Eighty-Five

Basics

Value: -1686 → -1685 → -1684

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 5 × 337

Divisors: 1, 5, 337, 1685

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -11010010101

Octal: -3225

Duodecimal: -B85

Hexadecimal: -695

Square: 2839225

Square Root: 41.048751503547585

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

1 + ∑_n>=1 a_n xⁿ = ∏_n>=1 (1-xⁿ)^prime(n). A7441

Expansion of 1/(1+x+2·x²-2·x³). A77977

Row sums of triangle A091698. A91699

Expansion of 1/(1-x+2·x²+2·x³). A77956

Coefficients in the q-expansion of the Gamma₀(6) weight -2 meromorphic modular form F(z) (see Formula section for definition). A181102

E.g.f. satisfies A(x) = exp( x·exp(x³) / A(x) ). A362674

A triangular sequence of coefficients of polynomials: p(x,n)=(-(x - 1)ⁿ*Sum[(((-1)ⁿ*(2·k + 1)^{n - 1}))*x^k, {k,0, Infinity}]+2*(x - 1)^{n + 1}*Sum[((-1)^{n + 1}*kⁿ)*x^k, {k, 0, Infinity}]/x). A154338

a(n) = 4*(n+1)*n + 5. A78370

a(n) = n² + 4. A87475

Total number of ON cells at stage n of two-dimensional cellular automaton defined by "Rule 750" using the von Neumann neighborhood. A169707