Properties of the Number 18031

Eighteen Thousand Thirty-One

Basics

Value: 18030 → 18031 → 18032

Parity: odd

Prime: No

Previous Prime: 18013

Next Prime: 18041

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 13 × 19 × 73

Divisors: 1, 13, 19, 73, 247, 949, 1387, 18031

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100011001101111

Octal: 43157

Duodecimal: A527

Hexadecimal: 466f

Square: 325116961

Square Root: 134.27955912945202

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

O.g.f.: ∑_n>=0 n! * xⁿ / ∏_k=1..n (1 - n²*k·x). A229258

Partial sums of A006899. A170803

Numerators of the convergents of the continued fraction for 2^1/4 - 2^-1/4, the ordinate of the point of bisection of the arc of the unit lemniscate (x² + y²)² = x² - y² in the first quadrant. A154745

a(n) = 784·n - 1. A158399

Maximally idempotent integers with three or more factors. A306812

a(n) = ∑_k=1..n sigma₂(k) * floor(n/k). A356042

a(n) = a(1) + a(2) + ... + a(n-1) - a(m) for n >= 4, where m = 2^p+1 + 2 - n and p is the unique integer such that 2^p < n-1 <= 2^p+1, starting with a(1) = 1, a(2) = 3, and a(3) = 4. A49929

Largest proper divisor of the n-th Carmichael number (A002997). A81703

Partial sums of A000602. A173289

Numbers n such that 41#*2ⁿ-1 is prime, where # denotes the primorial, A002110. A176061