Bettie Page died at the age of 85 on 11 December 2008. MathBabbler's mother is named Betty (actually Elizabeth, but MathBabbler has only known her as Betty).

MathBabbler Number Analyst (MBNA) output: ========================================= 85 is a natural, whole, integer 85 is odd 85 proper divisors are: 1,5,17, 85 is deficient (sum of divisors is 23) 85 is unhappy 85 is not a Harshad number 85 is not prime 85 is undulating 85 has the prime factors: 5*17 85 in octal is 0125 85 in hexadecimal is 0x55 85 in binary is 1010101 (is evil) 85 nearest square numbers: -4...15 (81...100 [10]) sqrt(85) = 9.21954 ln(85) = 4.44265 log(85) = 1.92942 85 reciprocal is .01176470588235294117647058823529 85! is 2.8171e+128 85 is 27.0563 Pi years 85 is 4 score and 5 years

`written as a Roman numeral is`

85`.`

LXXXV

`is a semi-prime (i.e. it has only two prime factors).`

85

`is a 7th centered square number.`

85C(n) = n^2 + (n - 1)^2 C(7) = 7^2 + (7 - 1)^2 = 7^2 + 6^2 = 49 + 36 = 85

**Creator:** Gerald Thurman
[gthurman@gmail.com]

**Created:** 12 December 2008 (nBAB# 87)

This work is licensed under a Creative Commons Attribution 3.0 United States License.