Properties of the Number -2605

Six Hundred Five

Basics

Value: -2606 → -2605 → -2604

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 5 × 521

Divisors: 1, 5, 521, 2605

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -101000101101

Octal: -5055

Duodecimal: -1611

Hexadecimal: -a2d

Square: 6786025

Square Root: 51.03920062069938

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 + x²/(1 + x³/(1 + x⁵/(1 + x⁷/(1 + x¹¹/(1 + ... + x^prime(k)/(1 + ... ))))))), a continued fraction. A292803

Number of knapsack partitions of n. A108917

Number of partitions of n into prime parts. A607

a(n) = 4*(n+1)*n + 5. A78370

Coordination sequence for "cab" 3D uniform tiling formed from octahedra and truncated cubes. A299266

The number of n-full sets, F(n). A188431

Narayana-Zidek-Capell numbers: a(n) = 1 for n <= 2. Otherwise a(2n) = 2a(2n-1), a(2n+1) = 2a(2n) - a(n). A2083

Number of partitions of n into distinct parts (a₁, a₂, ... , a_m) (a₁ > a₂ > ... > a_m and ∑_k=1..m a_k = n) such that a1 - a2, a2 - a3, ..., a_m-1 - a_m are different. A320347

a(n) = floor(n*φ¹³), where φ is the golden ratio, A001622. A4928

Dispersion of A008851, (numbers >1 and congruent to 0 or 1 mod 5), by antidiagonals. A191722