Properties of the Number -1617

Six Hundred Seventeen

Basics

Value: -1618 → -1617 → -1616

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 7 ² × 11

Divisors: 1, 3, 7, 11, 21, 33, 49, 77, 147, 231

Polygonal

Triangular: No

Square: No

Pentagonal: Yes

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -11001010001

Octal: -3121

Duodecimal: -B29

Hexadecimal: -651

Square: 2614689

Square Root: 40.2119385257662

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

Triangle of Lehmer-Comtet numbers of the first kind. A8296

Nearest integer to n²*sin(n). A274087

Coefficients in the expansion of B⁷/C, in Watson's notation of page 118. A160534

G.f. satisfies A(x) = 1 + x·A(x) / (1 + x·A(x))⁵. A365088

Expansion of ∏_k>=1 1 / (1 + x^k)^Fibonacci(k). A357475

Triangle of numerators of Integral_x=0..1 LegendreP(m,x) * LegendreP(n,x) dx. A78297

A Chebyshev transform of the Padovan numbers. A100049

a(n) = p(n) - p(n-1) - p(n-2) + p(n-5), where p(n) = A000041(n). A195054

First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 347", based on the 5-celled von Neumann neighborhood. A271300

Pentagonal numbers: a(n) = n*(3·n-1)/2. A326