Properties of the Number 75021

Seventy-Five Thousand Twenty-One

Basics

Value: 75020 → 75021 → 75022

Parity: odd

Prime: No

Previous Prime: 75017

Next Prime: 75029

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 17 × 1471

Divisors: 1, 3, 17, 51, 1471, 4413, 25007, 75021

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10010010100001101

Octal: 222415

Duodecimal: 374B9

Hexadecimal: 1250d

Square: 5628150441

Square Root: 273.89961664814354

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) = Fibonacci(n) - 4. A157728

Expansion of (1+x)²/(1-2x²+x³). A113312

Sequence related to fifth roots of certain Fibonacci fractions. A127526

Expansion of -(3+9·x+2·x²)/((x+1)*(x²+3·x+1)). A131589

Row sums of triangle in A204026. A238374

a(1) = 1; for n>1, a(n) = the largest prime divisor of the number C(n) formed from the concatenation of n, n-1, n-2, n-3, ... down to 1. A75021