Properties of the Number 64421

Sixty-Four Thousand Four Hundred Twenty-One

Basics

Value: 64420 → 64421 → 64422

Parity: odd

Prime: No

Previous Prime: 64403

Next Prime: 64433

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 7 × 9203

Divisors: 1, 7, 9203, 64421

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1111101110100101

Octal: 175645

Duodecimal: 31345

Hexadecimal: fba5

Square: 4150065241

Square Root: 253.81292323284092

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

Numbers n such that there are exactly 4 primes p such that floor(n·log(n))+1<=p<=floor((n+1)*log(n+1))-1. A68362

Numbers k such that 7·R_k+2 - 2·10^k is prime, where R_k = 11...1 is the repunit (A002275) of length k. A257031

Number of even parts in the partitions of n into 10 parts. A309662

Term at which n appears in A064413 (if it begins at 2). A64421

a(n) = a(n-1)*a(n-2) with a(0)=1, a(1)=4. A10099