2 to the Negative 91st Power

Welcome to 2 to the negative 91st power, our post about the mathematical operation exponentiation of 2 to the power of -91.

If you have been looking for 2 to the negative ninety-first power, or if you have been wondering about 2 exponent minus 91, then you also have come to the right place.

The number 2 is called the base, and the number minus 91 is called the exponent. In this post we are going to answer the question what is 2 to the negative 91st power.

Keep reading to learn everything about two to the negative ninety-first power.

What is 2 to the Negative 91st Power?

2 to the negative 91st power is conventionally written as 2-91, with superscript for the exponent, but the notation using the caret symbol ^ can also be seen frequently: 2^-91.

2-91 stands for the mathematical operation exponentiation of two by the power of negative ninety-one.

As the exponent is a negative integer, exponentiation means the reciprocal of a repeated multiplication:

2 to the negative 91st power = \frac{1}{\underbrace{ {\rm 2 \times\thinspace ... \times\thinspace 2} }_{\rm 91 \thickspace times}}

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The absolute value of the exponent of the number -91, 91, denotes how many times to multiply the base (2), and the power’s minus sign stands for reciprocal.

Thus, we can answer what is 2 to the negative 91st power as

2 to the power of minus 91 = 2-91 = 1 / 24758800 7857076054 9798248448.

If you have come here in search of an exponentiation different to 2 to the negative ninety-first power, or if you like to experiment with bases and indices, then use our calculator below.

To stick with 2 to the power of negative 91 as an example, insert 2 for the base and enter -91 as the index, aka exponent or power.

Next, hit the convert button, then check the result.


2 to the negative 91st power is an exponentiation which belongs to the category powers of 2.

Similar exponentiations on our site in this category include, but are not limited, to:

Ahead is more info related to 2 to the negative 91 power, along with instructions how to use the search form, located in the sidebar or at the bottom, to obtain a number like 2 to the power negative 91.

2 to the Power of -91

Reading all of the above, you already know most about 2 to the power of minus 91, except for its inverse which is discussed a bit further below in this section.

Using the aforementioned search form you can look up many numbers, including, for instance, 2 to the power minus 91, and you will be taken to a result page with relevant posts.

Now, we would like to show you what the inverse operation of 2 to the negative 91st power, (2-91)−1, is. The inverse is the 1 over the 91st root of 291, and the math goes as follows:

(2-91)−1
= \frac{1}{\sqrt[91]{2^{91}}}
= \frac{1}{2^{91/91}}
= \frac{1}{2^{1}}
= \frac{1}{2}

Because the index of 91 is not a multiple of 2, which means odd, in contrast to even numbers, the operation produces only one value: (291)−1 = \frac{1}{2}.

Make sure to understand that exponentiation is not commutative, which means that 2-91 ≠ -912, and also note that (2-91)-1 ≠ 291, the inverse and reciprocal of 2-91, respectively.

You already know what 2 to the power of minus 91 equals, but you may also be interested in learning what 2 to the 91st power stands for.

Next is the summary of negative 91 power of 2.

Two to the Negative Ninety-first Power

You have reached the final part of two to the negative ninety-first power. Two to the negative ninety-first power is the same as 2 to the power minus 91 or 2 to the minus 91 power.

Exponentiations like 2-91 make it easier to write multiplications and to conduct math operations as numbers get either big or small, such as in case of decimal fractions with lots of trailing zeroes.

If you have been looking for 2 power -91, what is 2 to the negative 91 power, 2 exponent minus 91 or 91 negative power of 2, then it’s safe to assume that you have found your answer as well.

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