Properties of the Number 1685

One Thousand Six Hundred Eighty-Five

Basics

Value: 1684 → 1685 → 1686

Parity: odd

Prime: No

Previous Prime: 1669

Next Prime: 1693

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 5 × 337

Divisors: 1, 5, 337, 1685

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11010010101

Octal: 3225

Duodecimal: B85

Hexadecimal: 695

Square: 2839225

Square Root: 41.048751503547585

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) = 4*(n+1)*n + 5. A78370

a(n) = n² + 4. A87475

Total number of ON cells at stage n of two-dimensional cellular automaton defined by "Rule 750" using the von Neumann neighborhood. A169707

Second-order Fibonacci numbers. A10049

Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 1. A51966

a(n) = floor(n*φ¹⁴), where φ is the golden ratio, A001622. A4929

Number of integer partitions of n whose mean is a mode but not the only mode. A363731

a(n) = 2·n² + 3. A93328

a(n) = A003146(A003146(n)). A319972

Number of integer partitions of n with as many even parts as odd conjugate parts, and as many odd parts as even conjugate parts. A351981