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Encyclopedia :
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170 :
170 (number) |
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170 (number)170 is the natural number following 169 and preceding 171.
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 Numbers in the 170s171 = 3^2 19, triangular number, Harshad number ---- 172 = 2^2 43, noncototient ---- 173 = prime number, Sophie Germain prime, 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 ---- 178 = 2 89 ---- 179 = prime number, Sophie Germain prime, safe prime, strictly non-palindromic number ---- |
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