Properties of the Number -161564

One Hundred Sixty-One Thousand Five Hundred Sixty-Four

Basics

Value: -161565 → -161564 → -161563

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 2 ² × 13 ² × 239

Divisors: 1, 2, 4, 13, 26, 52, 169, 239, 338, 478

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

5184 Try Today's Challenge

Representations

Binary: -100111011100011100

Octal: -473434

Duodecimal: -795B8

Hexadecimal: -2771c

Square: 26102926096

Square Root: 401.95024567724795

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

List of triples (r,s,t): the matrix M = [[1,4,4][1,3,2][1,2,1]] is raised to successive negative powers, then (r,s,t) are the square roots of M[3,1], M[1,1], M[1,3] respectively. A249577

a(n) = 2·a(n-1) + a(n-2), with a(0) = 1, a(1) = 2, a(2) = 4. A52542

a(n) = 6·a(n-1) - a(n-2). A5319

A005319 and A002315 interleaved. A143608

Numerators of fractions in a 'zero-transform' approximation of sqrt(2) by means of a(n) = (a(n-1) + c)/(a(n-1) + 1) with c=2 and a(1)=0. A163271

Numerators of "Farey fraction" approximations to sqrt(2). A119016

Numerators of principal and intermediate convergents to 2^1/2. A143607

Series ratios converge alternately to sqrt(2) and 1+sqrt(1/2). A82766

Start with the sequence S(0)={1,1} and for k>0 define S(k) to be I(S(k-1)) where I denotes the operation of inserting, for i=1,2,3..., the term a(i)+a(i+1) between any two terms for which 4a(i+1)<=5a(i). The listed terms are the initial terms of the limit of this process as k goes to infinity. A82981

Lexicographically earliest sequence of distinct positive integers with no finite subset summing to a positive Pell number (A000129). A354005