Properties of the Number 18511

Eighteen Thousand Five Hundred Eleven

Basics

Value: 18510 → 18511 → 18512

Parity: odd

Prime: No

Previous Prime: 18503

Next Prime: 18517

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 107 × 173

Divisors: 1, 107, 173, 18511

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100100001001111

Octal: 44117

Duodecimal: A867

Hexadecimal: 484f

Square: 342657121

Square Root: 136.05513588247965

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

Number of compositions of n with no adjacent triples (..., x, y, z, ...) where x < y < z or x > y > z. A344614

a(n) = floor(n*(n-1)*(n-2)/4). A11886

Golden semiprimes: a(n)=p·q and abs(p*φ-q)<1, where φ = golden ratio = (1+sqrt(5))/2. A108540

Integers that are Rhonda numbers to base 12. A100971

Triangle read by rows: T(n,k) is the number of free polyominoes with n cells whose difference between length and width is k, n >= 1, k >= 0. A379625

Number of triangular partitions of n of order 3. A84439

Number of days after Mar 01 00 such that the date written in the format DD.MM.YY is palindromic. A210887

Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 49 ones. A31817

a(n) = floor(n*(n³-n-3)/(2*(n-1))). A117561

Numbers k such that k²+1 = 2p,(k+1)²+1 = 5q, (k+2)²+1 = 10r where p, q, and r are primes. A181619