## The number 85

Numeral systems

Binary: 1010101

Septimal (base 7): 151

Octal: 125

Hexadecimal: 55

Base 24: 3D

Factorization

85 = 5 × 17

85 has 4 divisors: 1, 5, 17, 85

Sum of all divisors other than 85:

23
Sums & differences

Sum of 2 squares: 85 = 7^{2} + 6^{2} = 9^{2} + 2^{2}

Difference of 2 squares: 85 = 11^{2} - 6^{2} = 43^{2} - 42^{2}

Characteristics

85 is a palindromic number in binary system (1010101)

85 is a palindromic number in septimal system (151)

Related primes

The 85th prime number is:

439Previous prime number:

83 — Next prime number:

89