Properties of the Number -199991

One Hundred Ninety-Nine Thousand Nine Hundred Ninety-One

Basics

Value: -199992 → -199991 → -199990

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 38

Digital Root: 2

Palindrome: Yes

Factorization: 11 × 18181

Divisors: 1, 11, 18181, 199991

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -110000110100110111

Octal: -606467

Duodecimal: -9789B

Hexadecimal: -30d37

Square: 39996400081

Square Root: 447.2035330808557

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

n sets a new record for the number of integers k such that n = k + reverse(k). A67035

Define d(n,k) to be the number of '1' digits required to write out all the integers from 1 through k in base n. E.g., d(10,9) = 1 (just '1'), d(10,10) = 2 ('1' and '10'), d(10,11) = 4 ('1', '10' and '11'). Then a(n) is the first k >= 1 such that d(n,k) > k. A92175

Composite numbers whose prime factors contain no digits other than 1 and 8. A36308

Let s(n) be the smallest number·such that the decimal representation of n appears as a substring of the decimal representations of the numbers [0...x] more than·times. A164321

Base-ten n containing a digit making its n-th appearance in the list of consecutive positive integers. A339752

Palindromes k such that k + 11 is also a palindrome. A82275

First quadrisection of A332843. A330522

Smallest palindromic multiple of 11, sum of whose digits at some stage is equal to n. A83516

a(n) = n 9's sandwiched between two 1's. A185123