Properties of the Number -1216

Two Hundred Sixteen

Basics

Value: -1217 → -1216 → -1215

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 10

Digital Root: 1

Palindrome: No

Factorization: 2 ⁶ × 19

Divisors: 1, 2, 4, 8, 16, 19, 32, 38, 64, 76

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -10011000000

Octal: -2300

Duodecimal: -854

Hexadecimal: -4c0

Square: 1478656

Square Root: 34.87119154832539

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

Riordan array (1/(1+x), x(1-x)/(1+x)²). A110511

Triangle read by rows: T(r,c)=T(r,c-1)+T(r,c+1)+T(r-1,c-1). A129394

a(n) = (n+1)*(9-9·n+5·n²-n³). A157371

a(1) = 1; a(n) = -∑_{d∣n, d < n} A341512(n/d) * a(d), where A341512(n) = σ(n)*A003961(n) - n*σ(A003961(n)). A347096

Alternating sum of heptagonal numbers. A266085

a(1) = 1; a(n+1) = a(n) +- (sum of digits of a(1) up to a(n)), with "+" when a(n) is odd, or "-" if even. A332058

a(n) is the numerator of the real part of 1/(1+i/2)ⁿ, where i is the imaginary unit. A370191

McKay-Thompson series of class 20D for Monster. A58553

Matrix square of inverse triangle A096651; transforms n-dimensional partitions into (n-2)-dimensional partitions. A96875

Table, read by rows, of coefficients of characteristic polynomials of almost prime matrices. A131175