Properties of the Number 825

Eight Hundred Twenty-Five

Basics

Value: 824 → 825 → 826

Parity: odd

Prime: No

Previous Prime: 823

Next Prime: 827

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 5 ² × 11

Divisors: 1, 3, 5, 11, 15, 25, 33, 55, 75, 165

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1100111001

Octal: 1471

Duodecimal: 589

Hexadecimal: 339

Square: 680625

Square Root: 28.722813232690143

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 Narayana numbers T(n,k) = C(n-1,k-1)*C(n,k-1)/k with 1 <= k <= n, read by rows. Also called the Catalan triangle. A1263

Numbers k that divide the (right) concatenation of all numbers <= k written in base 25 (most significant digit on left). A29470

4-dimensional pyramidal numbers: a(n) = n²*(n²-1)/12. A2415

Expansion of 1/((1-x)⁴*(1+x)). A2623

Number of "ON" cells at n-th stage in the "Ulam-Warburton" two-dimensional cellular automaton. A147562

Smith (or joke) numbers: composite numbers k such that sum of digits of k = sum of digits of prime factors of k (counted with multiplicity). A6753

Generalized 9-gonal (or enneagonal) numbers: m*(7·m - 5)/2 with m = 0, 1, -1, 2, -2, 3, -3, ... A118277

Numbers k such that the k-th partition number A000041(k) is prime. A46063

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

Numbers that are the sum of 6 positive 5th powers. A3351