Properties of the Number 61820

Sixty-One Thousand Eight Hundred Twenty

Basics

Value: 61819 → 61820 → 61821

Parity: even

Prime: No

Previous Prime: 61819

Next Prime: 61837

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2 ² × 5 × 11 × 281

Divisors: 1, 2, 4, 5, 10, 11, 20, 22, 44, 55

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

4823 Try Today's Challenge

Representations

Binary: 1111000101111100

Octal: 170574

Duodecimal: 2B938

Hexadecimal: f17c

Square: 3821712400

Square Root: 248.63628053846043

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 (n+2) X 8 binary arrays avoiding patterns 001 and 110 in rows, columns and nw-to-se diagonals. A202445

Number of (3+1)X(n+1) arrays of permutations of 0..n·4+3 with each element having directed index change 1,0 0,-1 1,2 or -1,1. A264586

T(n,k)=Number of (n+2)X(k+2) binary arrays avoiding patterns 001 and 110 in rows, columns and nw-to-se diagonals. A202447

Multiples of 4 containing only digits 0,...,4. A61820