Properties of the Number 16191

Sixteen Thousand One Hundred Ninety-One

Basics

Value: 16190 → 16191 → 16192

Parity: odd

Prime: No

Previous Prime: 16189

Next Prime: 16193

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 7 × 257

Divisors: 1, 3, 7, 9, 21, 63, 257, 771, 1799, 2313

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11111100111111

Octal: 37477

Duodecimal: 9453

Hexadecimal: 3f3f

Square: 262148481

Square Root: 127.24386036269098

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

Strobogrammatic numbers: the same upside down. A787

Base 10 numbers that are palindromic in bases 2 and 4. A97856

Reversion of (1 + g.f. for primes). A7296

Numbers that are the same upside down (using only digits 0, 1, 6 and 9). A169731

Number of A095748-primes in range ]2ⁿ,2ⁿ⁺¹]. A95758

Numbers whose binary representation is palindromic and in which all runs of 0's and 1's have length at least 2. A222813

On a spirally numbered square grid, with labels starting at 1, this is the number of the last cell that an (n,n+1) leaper reaches before getting trapped, or -1 if it never gets trapped. A343179

Nonnegative integers k such that the Euclidean distance between the vector of proportions of the digits 0-9 in 2^k and the uniform distribution (1/10, ..., 1/10) sets a new minimum. A393331

Numbers which do not reach zero under either of the iterations: x -> floor(sqrt(x)) * (x - floor(sqrt(x))²) or y -> ceiling(sqrt(y)) * (ceiling(sqrt(y))² - y). A219963

Binary palindromic numbers with only two 0 bits, both in the middle. A220236