Properties of the Number 31691

Thirty-One Thousand Six Hundred Ninety-One

Basics

Value: 31690 → 31691 → 31692

Parity: odd

Prime: No

Previous Prime: 31687

Next Prime: 31699

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 11 × 43 × 67

Divisors: 1, 11, 43, 67, 473, 737, 2881, 31691

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 111101111001011

Octal: 75713

Duodecimal: 1640B

Hexadecimal: 7bcb

Square: 1004319481

Square Root: 178.0196618354276

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) = ((3+2·sqrt(2))*(5+sqrt(2))ⁿ + (3-2·sqrt(2))*(5-sqrt(2))ⁿ)/2. A163605

Expansion of 1/(1 - x - x⁵ + x⁶ - x⁷ - x¹¹ + x¹²). A225500

G.f. A(x) satisfies: A(x)² - 4·A(x)³ = A(x²). A274736

Number of walks within N³ (the first octant of Z³) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 1), (0, 1, -1), (1, -1, 0), (1, 0, 0)}. A148111

Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 13. A31691