Properties of the Number 18631

Eighteen Thousand Six Hundred Thirty-One

Basics

Value: 18630 → 18631 → 18632

Parity: odd

Prime: No

Previous Prime: 18617

Next Prime: 18637

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 31 × 601

Divisors: 1, 31, 601, 18631

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100100011000111

Octal: 44307

Duodecimal: A947

Hexadecimal: 48c7

Square: 347114161

Square Root: 136.49542116862384

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) = (2·n-1)*(5·n²-5·n+2)/2. A63495

Odd integers n such that 2ⁿ == 2⁶ (mod n). A215610

Sum of all the middle parts in the partitions of 3n into 3 parts. A236364

Numerator of 1ⁿ/n + 2ⁿ/(n-1) + 3ⁿ/(n-2) +...+ (n-1)ⁿ/2 + nⁿ/1. A115071

Numbers k > 1 such that k mod ord2(k) is even, where ord2(k) is the order of 2 mod k. A36260

Indices m such that A128646(m)-1 is prime, where A128646 = denominator of partial sums of 1/(p(i)-1). A137689

a(n) = p² - p - 1 where p = prime(n), the n-th prime. A306190

Divisors of 2⁵⁰ - 1. A3554

Smallest k>1 such that k(p-1)-1 is divisible by p², p=n-th prime. A39914

Triangle read by rows: coefficients η(n,k) arising from the study of completely transitive graphs on n nodes. A259970