Properties of the Number 91809

Ninety-One Thousand Eight Hundred Nine

Basics

Value: 91808 → 91809 → 91810

Parity: odd

Prime: No

Previous Prime: 91807

Next Prime: 91811

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 101 ²

Divisors: 1, 3, 9, 101, 303, 909, 10201, 30603, 91809

Polygonal

Triangular: No

Square: Yes

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10110011010100001

Octal: 263241

Duodecimal: 45169

Hexadecimal: 166a1

Square: 8428892481

Square Root: 303

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

Odd refactorable numbers. A36896

a(n) = (11·n + 6)². A17462

Squares which are the arithmetic mean of two consecutive primes. A69495

Squares with initial digit '9'. A45793

Numbers k such that k*(k+1) gives the concatenation of two numbers m and m+1. A116294

Squares k such that k - 2 and k + 2 are prime. A144938

Odd squares k for which A379113(k) > 1, i.e., k that have a proper unitary divisor d > 1 such that A048720(A065621(σ(d)),σ(k/d)) is equal to σ(k). A379121

Squares of palindromes. A14186

a(n) = A110722(n)/121. A110723

Perfect squares k such that each decimal digit of k is equal to the difference of at least two other digits of k. A255893