Properties of the Number 18122

Eighteen Thousand One Hundred Twenty-Two

Basics

Value: 18121 → 18122 → 18123

Parity: even

Prime: No

Previous Prime: 18121

Next Prime: 18127

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 × 13 × 17 × 41

Divisors: 1, 2, 13, 17, 26, 34, 41, 82, 221, 442

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100011011001010

Octal: 43312

Duodecimal: A5A2

Hexadecimal: 46ca

Square: 328406884

Square Root: 134.61797799699713

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

a(n) = binomial(2·n-1, n) - binomial(2·n-1, n+3). A26016

Base-2 digital convolution sequence. A33639

T(n, k) = S(2·n + 1, n, k + 1) for 0<=k<=n and n >= 0, array S as in A050157. A50158

T(n,k) = S(2n-1,n-1,k-1), 0<=k<=n, n >= 0, array S as in A050157. A50159

Twice 13-gonal numbers: a(n) = n*(11·n - 9). A152997

Numbers which are the sum of two squared primes in exactly three ways (ignoring order). A226562

Numbers k that are the product of four distinct primes such that x²+y² = k has integer solutions. A248712

Expansion of (1+x²*C⁴)*C, where C = (1 - sqrt(1-4·x))/(2·x) is g.f. for Catalan numbers, A000108. A71725

Inverse of Riordan array (1/(1+x+x²),x/(1+x)²). A122919

Numbers that can be represented as a sum of two distinct nontrivial prime powers in three or more ways. A225104