Properties of the Number 891

Eight Hundred Ninety-One

Basics

Value: 890 → 891 → 892

Parity: odd

Prime: No

Previous Prime: 887

Next Prime: 907

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ⁴ × 11

Divisors: 1, 3, 9, 11, 27, 33, 81, 99, 297, 891

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1101111011

Octal: 1573

Duodecimal: 623

Hexadecimal: 37b

Square: 793881

Square Root: 29.8496231131986

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 having k prime factors (counted with multiplicity), the largest of which is the k-th prime. A106529

Octahedral numbers: a(n) = n*(2·n² + 1)/3. A5900

a(n) is the smallest m > 1 such that m divides ∑_k=1..m prime(k)ⁿ. A85450

a(n) = image of n under the Kaprekar map n -> (n with digits sorted into descending order) - (n with digits sorted into ascending order). A151949

a(n) = (2·n - 1)*(8·n² - 8·n + 3)/3. A63496

Number of partitions of n into odd parts greater than 1. A87897

a(n) = n*(n + 6). A28560

Numbers that are the sum of 10 positive 5th powers. A3355

Expansion of (1+x²)/((1-x)²*(1-x²)²). A5993

Numbers whose base-2 representation is the juxtaposition of two identical strings. A20330