C++11: literal 7 is a prvalue?

I came across this article. And its example says:

int main()
{
    int i, j, *p;

    // Correct usage: the variable i is an lvalue and the literal 7 is a prvalue.
    i = 7;
...
}

I wonder why literal 7 is a prvalue.

The standard [7.2.1.1.2] says:

A prvalue is an expression whose evaluation
initializes an object or a bit-field, or computes the value of an
operand of an operator, as specified by the context in which it
appears, or an expression that has type cv void.

The expression 7 itself doesn't initializes an object nor a bit-field, nor computes the value of an operand of an operator as 7 itself doesn't have an operator.

Maybe I don't interpret the standard correctly.