Properties of the Number 31381

Thirty-One Thousand Three Hundred Eighty-One

Basics

Value: 31380 → 31381 → 31382

Parity: odd

Prime: No

Previous Prime: 31379

Next Prime: 31387

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 7 × 4483

Divisors: 1, 7, 4483, 31381

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111101010010101

Octal: 75225

Duodecimal: 161B1

Hexadecimal: 7a95

Square: 984767161

Square Root: 177.14683175264523

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) = -n³ + 7·n² - 5·n + 1. A161708

Nonattacking queens on a 2n+1 X 2n+1 toroidal board, solutions which differ only by rotation, reflection or torus shift count only once. A53994

Crystal ball sequence for diamond. A7904

Quadruple lucky numbers (lower terms). Numbers n such that n, n+2, n+6, n+8 are all Lucky numbers. A139783

a(n) = prime(7·n - 2). A31381

Number of nX6 0..2 arrays with no element equal to any value at offset (-1,-2) (-2,-1) or (-1,0) and new values introduced in order 0..2. A274726

Number of 6Xn 0..2 arrays with no element equal to any value at offset (-2,-1) (-1,1) or (0,-1) and new values introduced in order 0..2. A276303