Properties of the Number 61891

Sixty-One Thousand Eight Hundred Ninety-One

Basics

Value: 61890 → 61891 → 61892

Parity: odd

Prime: No

Previous Prime: 61879

Next Prime: 61909

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 59 × 1049

Divisors: 1, 59, 1049, 61891

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1111000111000011

Octal: 170703

Duodecimal: 2B997

Hexadecimal: f1c3

Square: 3830495881

Square Root: 248.77901840790352

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

Number of subsets of {1, ..., n} that are not sum-free. A88809

Number of positive integers <= 2ⁿ of form 9 x² + 10 y². A54194

a(0) = 1; for n>0, a(n) = a(n-1) if n is already in the sequence, a(n) = a(n-1) + 3 otherwise. A61891

Numbers k such that A383844(k) and A383844(k+1) are nonzero. A384310