Properties of the Number 16391

Sixteen Thousand Three Hundred Ninety-One

Basics

Value: 16390 → 16391 → 16392

Parity: odd

Prime: No

Previous Prime: 16381

Next Prime: 16411

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 37 × 443

Divisors: 1, 37, 443, 16391

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100000000000111

Octal: 40007

Duodecimal: 959B

Hexadecimal: 4007

Square: 268664881

Square Root: 128.02734082999615

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

Numbers that are the sum of 8 positive 7th powers. A3375

a(n) = smallest number that leads to a new fixed point under the base-2 Kaprekar map of A164884. A164887

a(n) = 4ⁿ + n. A158879

a(n) = 2ⁿ + 7. A168415

a(n) = A106315(A156552(n)). A324051

a(n) = n*(25·n - 39)/2. A263231

a(1) = 11; a(n) = if n == 2 mod 3 then a(n-1)-3, if n == 0 mod 3 then a(n-1)-2, if n == 1 mod 3 then a(n-1)*2. A85688

a(n) = 2ⁿ + ceiling(n/2). A134522

Expansion of (5 - 9·x + 6·x²)/(1-x)⁴. A80957

Minimal number (in decimal representation) with n nonprime substrings in base-4 representation (substrings with leading zeros are considered to be nonprime). A217104