Properties of the Number 61391

Sixty-One Thousand Three Hundred Ninety-One

Basics

Value: 61390 → 61391 → 61392

Parity: odd

Prime: No

Previous Prime: 61381

Next Prime: 61403

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 11 × 5581

Divisors: 1, 11, 5581, 61391

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1110111111001111

Octal: 167717

Duodecimal: 2B63B

Hexadecimal: efcf

Square: 3768854881

Square Root: 247.77207267971102

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

Square root of squares in A145768 (XOR of squares of the numbers 1..n). A145829

Numerator of Laguerre(n, -6). A160607

Row sums of triangle A115237. A115238

Strong pseudoprimes to base 53. A20279

Decimal representation of n-th iteration of the one-dimensional cellular automaton defined by Rule 950, based on the 4-celled von Neumann neighborhood starting with a single black cell. A334244

a(n) = t(n,3) = ∑_d∣n τ(d³), where τ(n) = number of divisors of n, cf. A000005. A61391

a(n) = ∑_{k=0..floor(n/3)} binomial(4·n-3·k-1,n-3·k). A371771