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Properties of the Number 18997

Eighteen Thousand Nine Hundred Ninety-Seven

Basics

Value: 18996 → 18997 → 18998

Parity: odd

Prime: No

Previous Prime: 18979

Next Prime: 19001

Digit Sum: 34

Digital Root: 7

Palindrome: No

Factorization: 11 2 × 157

Divisors: 1, 11, 121, 157, 1727, 18997

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100101000110101

Octal: 45065

Duodecimal: ABB1

Hexadecimal: 4a35

Square: 360886009

Square Root: 137.82960494755835

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 numbers k such that (10k - 1)/3 - 2·10floor(k/2) is a palindromic wing prime (a.k.a. near-repdigit palindromic prime) of the form 3...313...3. A77775
E.g.f.: artanh(x·exp(x)). A216401
Numbers n of the form k + reverse(k) for exactly two k. A72040
Numbers n such that Maple 9.5, Maple 10, Maple 11 and Maple 12 give the wrong answers for the number of partitions of n. A110375
a(n) = AlexanderPolynomial[n] defined as Det[Transpose[S]-n S] where S is Kronecker Product of two 2 X 2 Seifert matrices {{-1, 1}, {0, -1}} [X] {{-1, 1}, {0, -1}} = {{1, -1, -1, 1}, {0, 1, 0, -1}, {0, 0, 1, -1}, {0, 0, 0, 1}}. A138849
Composite numbers n such that 8·n2-2·n-1 divides the primitive part U(n) of Fibonacci(n). A159234
Number of aperiodic necklaces (Lyndon words) with k<=5 black beads and n-k white beads. A277629
a(n) = smallest k such that li(k) - π(k) >= n, where li(k) is the logarithmic integral and π(x) is the number of primes <= x. A359145
Composite numbers coprime to 6 such that A179382(n) = A000265(n-1), the odd part of n-1. A225913
Number of n-dimensional representations of the group SU(3). A346159