Properties of the Number 85

Eighty-Five

Basics

Value: 84 → 85 → 86

Parity: odd

Prime: No

Previous Prime: 83

Next Prime: 89

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 5 × 17

Divisors: 1, 5, 17, 85

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1010101

Octal: 125

Duodecimal: 71

Hexadecimal: 55

Square: 7225

Square Root: 9.219544457292887

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

Squarefree numbers: numbers that are not divisible by a square greater than 1. A5117

Semiprimes (or biprimes): products of two primes. A1358

The odd numbers: a(n) = 2·n + 1. A5408

The composite numbers: numbers n of the form x·y for x > 1 and y > 1. A2808

Completely multiplicative with a(prime(k)) = prime(k+1). A3961

Jacobsthal sequence (or Jacobsthal numbers): a(n) = a(n-1) + 2·a(n-2), with a(0) = 0, a(1) = 1; also a(n) = nearest integer to 2ⁿ/3. A1045

Read n backwards (referred to as R(n) in many sequences). A4086

Moser-de Bruijn sequence: sums of distinct powers of 4. A695

Squarefree semiprimes: Numbers that are the product of two distinct primes. A6881

The nonprime numbers: 1 together with the composite numbers, A002808. A18252

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