Properties of the Number 18917

Eighteen Thousand Nine Hundred Seventeen

Basics

Value: 18916 → 18917 → 18918

Parity: odd

Prime: Yes

Previous Prime: 18913

Next Prime: 18919

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 18917

Divisors: 1, 18917

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100100111100101

Octal: 44745

Duodecimal: AB45

Hexadecimal: 49e5

Square: 357852889

Square Root: 137.53908535394584

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

Discriminants of real quadratic fields with class number 1 and related continued fraction period length of 21. A51962

Primes of the form k(k+1)/2+2 (i.e., two more than a triangular number). A55472

Number of 2 X 2 matrices having all terms in {1,...,n} and positive determinant. A211059

a(n) = A379597(n) - A381710(n). A381711

Number of triangular partitions of n of order 6. A276235

Denominators associated with A109139. A109140

Minimum numbers whose φ of φ are multiples of the n-th prime: the n-th term is the minimum integer·such that: prime(n) | φ(φ(x)), prime(n) being the n-th prime. A167766

Imbalance of the number of parts of all partitions of n. A194796

a(n) is the total number of rows of circles of radius r packing into a circle of radius R, where r = R/2ⁿ. A239206

Prime quadruples: 3rd term. A136721