Properties of the Number 25807

Twenty-Five Thousand Eight Hundred Seven

Basics

Value: 25806 → 25807 → 25808

Parity: odd

Prime: No

Previous Prime: 25801

Next Prime: 25819

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 131 × 197

Divisors: 1, 131, 197, 25807

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110010011001111

Octal: 62317

Duodecimal: 12B27

Hexadecimal: 64cf

Square: 666001249

Square Root: 160.6455726125062

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

Partial sums of A299266. A299267

Semiprimes whose prime factors are of equal binary length and which differ from each other in exactly three bit positions. A261075

Expansion of 1/(1 - 5·x + 7·x²). A99450

Numbers m such that m - 2 divides m^m + 2. A249751

Integers arising in A133677. A133645

Q-residue of the triangle A051162, where Q is the triangular array (t(i,j)) given by t(i,j)=1. (See Comments.) A193658

The smallest positive number such that sopfr(|a(n) - n|) = sopfr(a(n) + n) and ω(|a(n) - n|) = ω(a(n) + n), where sopfr(k) is the sum of the primes dividing k, with repetition. A370504

Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 39 ones. A31807

Composite numbers which in base 6 contain their largest proper factor as a substring. A63156

Semiprimes of the form S(n) + T(n) where S(n) and T(n) are the n-th square and the n-th triangular numbers. A240914