Properties of the Number 25641

Twenty-Five Thousand Six Hundred Forty-One

Basics

Value: 25640 → 25641 → 25642

Parity: odd

Prime: No

Previous Prime: 25639

Next Prime: 25643

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 7 × 11 × 37

Divisors: 1, 3, 7, 9, 11, 21, 33, 37, 63, 77

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110010000101001

Octal: 62051

Duodecimal: 12A09

Hexadecimal: 6429

Square: 657460881

Square Root: 160.1280737409902

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

Numbers k such that the central binomial coefficient C(2k,k) is divisible by k². A121943

Decimal form of the period of 1/n for n such that gcd(n,10)=1. Leading zeros are suppressed. A178505

a(n) is the least positive integer such that nextprime(a(n)ⁿ) - prevprime(a(n)ⁿ) = 4. A90125

The triangle in A151359 read by rows downwards. A151511

Number of Pythagorean quadruples mod n; i.e., number of solutions to w² + x² + y² = z² mod n. A96018

Triangle read by rows: T(n,k) = number of partitions of [1..k] into n nonempty clumps of sizes 1, 2, 3, 4, 5 or 6 (n >= 0, 0 <= k <= 6n). A151359

Numbers n such that n⁶ + 272 is prime. A161998

4th-largest term in n-th row of Stern's diatomic triangle A002487. A244474

Expansion of e.g.f. exp(g³ - 1), where g = 1+x·g⁴ is the g.f. of A002293. A391549

a(n) = n*(3·n² - 5·n + 3). A226450