Properties of the Number 31281

Thirty-One Thousand Two Hundred Eighty-One

Basics

Value: 31280 → 31281 → 31282

Parity: odd

Prime: No

Previous Prime: 31277

Next Prime: 31307

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 10427

Divisors: 1, 3, 10427, 31281

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111101000110001

Octal: 75061

Duodecimal: 16129

Hexadecimal: 7a31

Square: 978500961

Square Root: 176.8643548033351

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) = [ a(n-1)/a(1) ] + [ a(n-3)/a(3) ] + [ a(n-5)/a(5) ] + ..., for n >= 3. A22872

Numbers whose set of base-13 digits is {1,3}. A32920

Starting positions of strings of 3 1's in the decimal expansion of π. A50209

Expansion of x*(1+2·x+8·x²+4·x³+3·x⁴) / ( (1+x)²*(x-1)⁴ ). A178947

a(n)=(# 1's)-(# 0's) in first n terms of A031269. A31281