Properties of the Number 811

Eight Hundred Eleven

Basics

Value: 810 → 811 → 812

Parity: odd

Prime: Yes

Previous Prime: 809

Next Prime: 821

Digit Sum: 10

Digital Root: 1

Palindrome: No

Factorization: 811

Divisors: 1, 811

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1100101011

Octal: 1453

Duodecimal: 577

Hexadecimal: 32b

Square: 657721

Square Root: 28.478061731796284

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

Greater of twin primes. A6512

a(n) = n + (n+1)². A28387

Primes p such that 2p-1 is also prime. A5382

Primes of the form 10·n+1. A30430

Irregular primes: primes p such that at least one of the numerators of the Bernoulli numbers B₂, B₄, ..., B_p-3 (A000367) is divisible by p. A928

Full reptend primes: primes with primitive root 10. A1913

a(n) = ∑_d∣n p(d), where p(d) = A000041 = number of partitions of d. A47968

Primes == 3 (mod 8). A7520

Primes that become another prime under the map 8 <-> 9 (acting on the decimal digits). A175789

Expansion of x²*(1+x-x²)/((1-x²)*(1-x)²). A24206