Properties of the Number 64945

Sixty-Four Thousand Nine Hundred Forty-Five

Basics

Value: 64944 → 64945 → 64946

Parity: odd

Prime: No

Previous Prime: 64937

Next Prime: 64951

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 5 × 31 × 419

Divisors: 1, 5, 31, 155, 419, 2095, 12989, 64945

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1111110110110001

Octal: 176661

Duodecimal: 31701

Hexadecimal: fdb1

Square: 4217853025

Square Root: 254.8430889782966

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(0)=1, a(1)=1, a(n) = 9·a(n/2) for even n >= 2, and a(n) = 8·a((n-1)/2) + a((n+1)/2) for odd n >= 3. A116526

The number of 321- and 2143-avoiding permutations of length n. A88921

a(n) = ∑_{i∣n, j∣n, j >= i} i. A64945