Properties of the Number 61808

Sixty-One Thousand Eight Hundred Eight

Basics

Value: 61807 → 61808 → 61809

Parity: even

Prime: No

Previous Prime: 61781

Next Prime: 61813

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 2 ⁴ × 3863

Divisors: 1, 2, 4, 8, 16, 3863, 7726, 15452, 30904, 61808

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 1111000101110000

Octal: 170560

Duodecimal: 2B928

Hexadecimal: f170

Square: 3820228864

Square Root: 248.61214773216534

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

T(n,k)=Number of nXk binary arrays whose sum with another nXk binary array containing no more than two 1s has rows and columns in lexicographically nondecreasing order. A225982

Number of binary words of length n that contain all sixteen 4-bit words as (possibly overlapping) contiguous subwords. A242257

Number of nX4 binary arrays whose sum with another nX4 binary array containing no more than two 1s has rows and columns in lexicographically nondecreasing order. A225978

Number of nX5 binary arrays whose sum with another nX5 binary array containing no more than two 1s has rows and columns in lexicographically nondecreasing order. A225979

a(n) is the smallest number with all digits odd that is divisible by 2n-1. A61808