Properties of the Number -212

Two Hundred Twelve

Basics

Value: -213 → -212 → -211

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 5

Digital Root: 5

Palindrome: Yes

Factorization: 2 ² × 53

Divisors: 1, 2, 4, 53, 106, 212

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -11010100

Octal: -324

Duodecimal: -158

Hexadecimal: -d4

Square: 44944

Square Root: 14.560219778561036

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

E.g.f.: exp(-exp(-x)+1+x). A109747

Partial alternating sums of the Dedekind ψ function (A001615): a(n) = ∑_k=1..n (-1)^k+1 * ψ(k). A357817

E.g.f. satisfies: A(x) = exp( x * (1 + 1/A(x))/2 ). A349719

Expansion of 1/(2 - ∏_k>=1 1/(1 + x^k)). A307060

Discriminants of quadratic number fields Q(sqrt -n) for n squarefree. A33197

Expansion of ∏_k>=1 1/(1+x^k)^k⁵ in powers of x. A284899

a(n) = n - 2^{sum of digits of n}. A328882

Matrix inverse of triangle A121336, where A121336(n,k) = C( n*(n+1)/2 + n-k + 2, n-k) for n>=k>=0. A121441

Choose smallest m>0 such that the n-th rational prime p ramifies in the imaginary quadratic extension field K = Q(sqrt(-m)); a(n) = discriminant(K). A220861

Dirichlet inverse of A006369, the inverse permutation of "amusical permutation". A349368