Properties of the Number 61645

Sixty-One Thousand Six Hundred Forty-Five

Basics

Value: 61644 → 61645 → 61646

Parity: odd

Prime: No

Previous Prime: 61643

Next Prime: 61651

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 5 × 12329

Divisors: 1, 5, 12329, 61645

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 1111000011001101

Octal: 170315

Duodecimal: 2B811

Hexadecimal: f0cd

Square: 3800106025

Square Root: 248.28411145298847

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

Floor[n(n-1)(n-2)(n-3)/14]. A11924

a(n) = n+binomial(2·n-6,n-3)+binomial(2·n-5,n-3)+binomial(n-1,n-3)+∑_i=1..n-3 (binomial(n+i-3,n-3)+2·n-i-5). A274295

a(n) is the number of divisors of n-th even perfect number. A61645