Properties of the Number 18155

Eighteen Thousand One Hundred Fifty-Five

Basics

Value: 18154 → 18155 → 18156

Parity: odd

Prime: No

Previous Prime: 18149

Next Prime: 18169

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 5 × 3631

Divisors: 1, 5, 3631, 18155

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100011011101011

Octal: 43353

Duodecimal: A60B

Hexadecimal: 46eb

Square: 329604025

Square Root: 134.740491315714

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 terms in a symmetrical determinant: a(n) = n·a(n-1) - (n-1)*(n-2)*a(n-3)/2. A2135

Number A(n,k) of factorizations of m^k into n factors, where m is a product of exactly n distinct primes and each factor is a product of k primes (counted with multiplicity); square array A(n,k), n>=0, k>=0, read by antidiagonals. A257463

Array read by antidiagonals: T(n,k) is the number of k-regular multigraphs on n labeled nodes, loops allowed, n >= 0, k >= 0. A333467

Numbers n for which the digital sum contains the same distinct digits as the digital product but the digital sum is not equal to the digital product. A249335

Coefficient of x² in minimal polynomial of the continued fraction [1ⁿ,4,1,1,1,...], where 1ⁿ means n ones. A265802

Triangle read by rows: Cayley's numbers φ(m,n) (m,n>=0). Row m contains φ(m,0), φ(m-1,1), φ(m-2,2), ..., φ(0,m). A260338

Number of primes of the form b²+1 for b <= 10ⁿ that end in 1. A301943

G.f. A(x) satisfies [xⁿ] A(x)^prime(n) = prime(n) * nⁿ for n >= 1. A392213

Numbers k such that 3·10^k + 7·R_k is prime, where R_k = 11...1 is the repunit (A002275) of length k. A56705

Numbers k such that 459·2^k+1 is prime. A323199