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189.
189(一百八十九)是188與190之間的自然數。
- 合數,正因數有1、3、7、9、21、27、63和189。
- 質因數分解為
。
- 虧數,真因數和為131,虧度為58。
- 第88個十进制的等數位數。前一個為185、下一個為191。
- 第9個七邊形數,也是是64邊形數。
- 第5個中心立方數(Centered cube number),是二連續立方數的和,
。
- 第37個幸運數。
- 烏拉姆數列的第40項。
- 二進制為10111101,是迴文數,也是黑洞數。
- 可表示為二立方數的差,
。
- 有{p, p+2, p+6, p+8}形式四胞胎质数中,除了{5, 7, 11, 13}外,其他四胞胎质数均可表示為{10n+1, 10n+3, 10n+7, 10n+9},乘積最後三位數均為189,例如11 × 13 × 17 × 19 = 46189,101 × 103 × 107 × 109 = 121330189。
- 相反數-189為殭屍數,即位數和(首位含負號)的平方與自身的和大於零的負數,即
。前一個為-197,後一個為-188(OEIS數列A328933)。
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