Properties of the Number 1618

One Thousand Six Hundred Eighteen

Basics

Value: 1617 → 1618 → 1619

Parity: even

Prime: No

Previous Prime: 1613

Next Prime: 1619

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 2 × 809

Divisors: 1, 2, 809, 1618

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 11001010010

Octal: 3122

Duodecimal: B2A

Hexadecimal: 652

Square: 2617924

Square Root: 40.22437072223753

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

Y-toothpick sequence (see Comments lines for definition). A160120

Centered heptagonal numbers. A69099

Number of pairwise coprime strict compositions of n, where a singleton is not considered coprime unless it is (1). A337561

Number of free pure symmetric multifunctions in one symbol with n positions. A280000

|First digit - second digit + third digit - fourth digit ...| = 12. A60980

Coordination sequence for (2,5,7) tiling of hyperbolic plane. A265066

Semiprimes of form prime - 1. A77065

Positive integers n such that n⁵ + 1 is semiprime. A104238

Semiprimes with prime sum of factors: twice the lesser of the twin prime pairs. A108605

Number of integer partitions of n with a unique prime part. A379304