Properties of the Number 64681

Sixty-Four Thousand Six Hundred Eighty-One

Basics

Value: 64680 → 64681 → 64682

Parity: odd

Prime: No

Previous Prime: 64679

Next Prime: 64693

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 71 × 911

Divisors: 1, 71, 911, 64681

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1111110010101001

Octal: 176251

Duodecimal: 31521

Hexadecimal: fca9

Square: 4183631761

Square Root: 254.32459574331384

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

Bruckman-Lucas pseudoprimes: k | (L_k - 1), where k is composite and L_k = Lucas numbers A000032. A5845

Odd Fibonacci pseudoprimes: odd composite numbers k such that either (1) k divides Fibonacci(k-1) if k == +-1 (mod 5) or (2) k divides Fibonacci(k+1) if k == +-2 (mod 5). A81264

Strong pseudoprimes to base 7. A20233

Composite numbers k such that k divides F(k-1) where F(j) are the Fibonacci numbers. A69106

Composite n coprime to 5 such that Fibonacci(n) == Legendre(n,5) (mod n). A49062

Primitive part of Lucas(n). A61447

Odd composites m that divide Fibonacci(m)-1. A94394

Frobenius pseudoprimes with respect to Fibonacci polynomial x² - x - 1. A212424

Composite n such that n divides both Fibonacci(n-1) and Fibonacci(n) - 1. A94401

Euler pseudoprimes to base 7: composite integers such that abs(7^{(n - 1}/2)) == 1 mod n. A262054