Properties of the Number 25821

Twenty-Five Thousand Eight Hundred Twenty-One

Basics

Value: 25820 → 25821 → 25822

Parity: odd

Prime: No

Previous Prime: 25819

Next Prime: 25841

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 19 × 151

Divisors: 1, 3, 9, 19, 57, 151, 171, 453, 1359, 2869

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 110010011011101

Octal: 62335

Duodecimal: 12B39

Hexadecimal: 64dd

Square: 666724041

Square Root: 160.68914089010497

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 integer partitions of n with reverse-alternating sum < 0. A344608

Number of integer partitions of 2n with reverse-alternating sum < 0. A344743

Number of circular permutations with exactly one specified increasing or decreasing modular run (3-sequence), with clockwise and counterclockwise traversals not counted as distinct. A235937

Number of 3's in n-th term of A007651. A22468

Numbers k such that prime(k) + prime(k+1)*2 is a square. A64504

Index of smallest pentagonal number with n digits. A368088

a(n) = n-th prime number·n-th lucky number. A32601

Number of length n+2 0..9 arrays with no consecutive three elements summing to more than 9. A241615

Expansion of 1/((1-x²)*(1-x⁸)*(1-x⁹)). A25821