Properties of the Number -656

Six Hundred Fifty-Six

Basics

Value: -657 → -656 → -655

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 17

Digital Root: 8

Palindrome: Yes

Factorization: 2 ⁴ × 41

Divisors: 1, 2, 4, 8, 16, 41, 82, 164, 328, 656

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

4823 Try Today's Challenge

Representations

Binary: -1010010000

Octal: -1220

Duodecimal: -468

Hexadecimal: -290

Square: 430336

Square Root: 25.612496949731394

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 q-binomial coefficients for q=-9. A15121

Nearest integer to n²*sin(n). A274087

a(n) = nearest integer to n² * sin(sqrt(n)). A274088

Take alternate terms of A274088 and A274090. A274091

a(n) = ∑_{d∣n, d == 1 mod 4} d² - ∑_{d∣n, d == 3 mod 4} d². A2173

Expansion of q^-1/2 * (η(q) * η(q²))⁴ in powers of q. A30211

a(n) = (1 - (-9)ⁿ)/10. A14991

Imaginary parts of the recursive sequence a(n+2) = ∑_k=0..n binomial(n,k)*a(k)*a(n+1-k), with a(0)=2, a(1)=i. A289085

Expansion of ∏_k>=1 theta₄(x^k), where theta₄() is the Jacobi θ function. A320908

Expansion of (φ(-q) / φ(-q⁵))² in powers of q where φ() is a Ramanujan θ function. A138518