170 (number) Did You Mean 170?

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170 is the natural number following 169 and preceding 171.

List of numbers -- Integers AND1lt;AND1lt; 100 110 120 130 140 150 160 170 180 190 >>
Ordinal	One hundred and seventy
Cardinal	170th
Factorization	$2 \cdot 5 \cdot 17$
Roman numeral	CLXX
Binary	10101010
Hexadecimal	AA

One hundred seventy a sphenic number. It is the smallest n for which φ(n) and σ(n) are both square. But 170 is never a solution for φ(x), making it a nontotient. Nor is it ever a solution to x - φ(x), making it a noncototient.

One hundred seventy is also

The designation of spur route of Interstate 70.
The year AD 170 or 170 BC.

Numbers in the 170s

171 = 3^2 19, triangular number, Harshad number

172 = 2^2 43, noncototient

173 = prime number, Sophie Germain prime, Eisenstein prime with no imaginary part, sum of three consecutive primes (53 + 59 + 61)

174 = 2 3 29, sphenic number, nontotient

175 = 5^2 7

176 = 2^4 11, pentagonal number, octagonal number, octagonal pentagonal number, self number

177 = 3 59, magic constant of a magic square using only Chen primes:

$\begin{bmatrix} 17 & 89 & 71 \\ 113 & 59 & 5 \\ 47 & 29 & 101 \end{bmatrix}$

178 = 2 89

179 = prime number, Sophie Germain prime, safe prime, Chen prime, Eisenstein prime with no imaginary part, strictly non-palindromic number

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