Properties of the Number 61681

Sixty-One Thousand Six Hundred Eighty-One

Basics

Value: 61680 → 61681 → 61682

Parity: odd

Prime: Yes

Previous Prime: 61673

Next Prime: 61687

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 61681

Divisors: 1, 61681

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1111000011110001

Octal: 170361

Duodecimal: 2B841

Hexadecimal: f0f1

Square: 3804545761

Square Root: 248.35659846277488

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

Cyclotomic polynomials at x=2. A19320

Largest prime factor of 2ⁿ - 1. A5420

Zsigmondy numbers for a = 2, b = 1: Zs(n, 2, 1) is the greatest divisor of 2ⁿ - 1 (A000225) that is coprime to 2^m - 1 for all positive integers m < n. A64078

a(n) is the least prime such that the multiplicative order of 2 mod a(n) equals n, or a(n)=1 if no such prime exists. A112927

Largest prime factor of 2ⁿ + 1. A2587

a(n) = n⁴ - n³ + n² - n + 1. A60884

Largest prime factor of 4ⁿ + 1. A274903

Largest prime factor of 4ⁿ - 1. A274906

Largest prime factor of n⁴ + 1. A96172

a(n) is the least prime such that the multiplicative order of 4 mod a(n) equals n. A112092