Properties of the Number -1809025

Eight Hundred Nine Thousand Twenty-Five

Basics

Value: -1809026 → -1809025 → -1809024

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 5 ² × 269 ²

Divisors: 1, 5, 25, 269, 1345, 6725, 72361, 361805, 1809025

Polygonal

Triangular: No

Square: Yes

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8109 Try Today's Challenge

Representations

Binary: -110111001101010000001

Octal: -6715201

Duodecimal: -732A81

Hexadecimal: -1b9a81

Square: 3272571450625

Square Root: 1345

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

a(n) = ∑_k=0..n C(2·k, k)² * C(n+k, n-k). A243945

Number of n X 3 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 0 1 and 0 1 1 vertically. A207118

Number of (n+1)X(3+1) arrays of permutations of 0..n·4+3 with each element having directed index change -1,0 0,2 -1,-2 or 1,0. A264515