Properties of the Number 818

Eight Hundred Eighteen

Basics

Value: 817 → 818 → 819

Parity: even

Prime: No

Previous Prime: 811

Next Prime: 821

Digit Sum: 17

Digital Root: 8

Palindrome: Yes

Factorization: 2 × 409

Divisors: 1, 2, 409, 818

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1100110010

Octal: 1462

Duodecimal: 582

Hexadecimal: 332

Square: 669124

Square Root: 28.600699292150182

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

List of totally balanced sequences of 2n binary digits written in base 10. Binary expansion of each term contains n 0's and n 1's and reading from left to right (the most significant to the least significant bit), the number of 0's never exceeds the number of 1's. A14486

a(n) = binomial(n+1, 2) + n - 1 = n*(n+3)/2 - 1. A34856

Numbers m such that ∑_k=1..m (<1/2 + k·r> - <k·r>) = 0, where r=sqrt(2) and < > denotes fractional part. A194368

Triangle T(n,k) read by rows: T(n,k) is the number of compositions of n with k parts p at position p (fixed points), n>=0, 0<=k<=n. A238349

Numbers palindromic in bases 10 and 17. A97855

Number of integer partitions of n such that the greatest part is the unique mode. A362612

Numbers whose sum of digits is 17. A166370

Number of blobs with 2n+1 edges. A3168

Numbers of the form p² + q², with p and q primes. A45636

Strobogrammatic numbers: the same upside down. A787