Properties of the Number 41665

Forty-One Thousand Six Hundred Sixty-Five

Basics

Value: 41664 → 41665 → 41666

Parity: odd

Prime: No

Previous Prime: 41659

Next Prime: 41669

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 5 × 13 × 641

Divisors: 1, 5, 13, 65, 641, 3205, 8333, 41665

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 1010001011000001

Octal: 121301

Duodecimal: 20141

Hexadecimal: a2c1

Square: 1735972225

Square Root: 204.12006270820123

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) = (3 + 2·n + 6·n² + 4·n³)/3. A166464

Fermat pseudoprimes to base 2 with three prime factors. A215672

Relative of Hofstadter Q-sequence: a(n) = max(0, n+20830) for n <= 0; a(n) = a(n-a(n-1)) + a(n-a(n-2)) + a(n-a(n-3)) for n > 0. A283887

Sarrus numbers with more than 2 distinct prime factors. A80747

Fermat pseudoprimes to base 2 divisible by 5. A216023

Sarrus numbers n (A001567) which satisfy μ(n) = -1 and which are not Super-Poulet numbers (A050217). A74380

Pseudoprimes to base 2 of the form 4k+1. A178723

a(n) is the smallest n-gonal number that is a Fermat pseudoprime to base 2 (A001567), or -1 if no such number exists. A371759

Nonprimes k such that 9·k divides 2^k-1 - 1. A175521

Number of n X 5 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 1 and 1 0 1 vertically. A207166