Properties of the Number 64821

Sixty-Four Thousand Eight Hundred Twenty-One

Basics

Value: 64820 → 64821 → 64822

Parity: odd

Prime: No

Previous Prime: 64817

Next Prime: 64849

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 17 × 31 × 41

Divisors: 1, 3, 17, 31, 41, 51, 93, 123, 527, 697

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1111110100110101

Octal: 176465

Duodecimal: 31619

Hexadecimal: fd35

Square: 4201762041

Square Root: 254.5996857814243

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) = cpg(3, n) * cpg(4, n) * ... * cpg(n, n) where cpg(m, n) is the n-th m-th-order centered polygonal number. A257133

Pseudoquadprimes: p+4 for primes p where p+4 divides p^p+4 + 4 and p+4 is composite. A100875

Numbers k such that 6·3^k + 1 is prime. A216888

Number of ways of writing the numbers 1 .. n in a sequence so that the sum of any two adjacent numbers is a prime; reversing the sequence does not count as different. A64821