Properties of the Number -85

Eighty-Five

Basics

Value: -86 → -85 → -84

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 5 × 17

Divisors: 1, 5, 17, 85

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -1010101

Octal: -125

Duodecimal: -71

Hexadecimal: -55

Square: 7225

Square Root: 9.219544457292887

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

Expansion of 1/((1-x)*(1+2·x)). A77925

Triangle of Gaussian (or q-binomial) coefficients for q = -2. A15109

McKay-Thompson series of class 16B for the Monster group. A29839

a(n) = -a(n-1) - 2·a(n-2). A1607

Triangle of coefficients of certain polynomials used with prime numbers as variables in the computation of the array A103728. A103718

Expansion of ∏_{k > 0} 1/(1 + x^prime(k)). A48165

Coefficient of xⁿ in (∏_m=1..n(1-x^m))ⁿ. A8705

Dirichlet inverse of the gcd-sum function (A018804). A101035

The β triangle read by rows. A160480

Expansion of ∏_k>=1 (1 + x^9·k)/(1 + x^k). A261733