ℕ atory
Play Now

Properties of the Number 2605

Two Thousand Six Hundred Five

Basics

Value: 2604 → 2605 → 2606

Parity: odd

Prime: No

Previous Prime: 2593

Next Prime: 2609

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

Today's Target

4823 Try Today's Challenge

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

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, ... , am) (a1 > a2 > ... > am and ∑k=1..m ak = n) such that a1 - a2, a2 - a3, ..., am-1 - am 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
Composite and every divisor (except 1) contains the digit 5. A62672