numpy.int64 to string

I read a file in pandas and I pick up the value of a cell in the EXCEL sheet

let's say

prov = lectura.iat[1,7]

tells me that prov is of type numpy.int64 with print(type(prov))

then I want to use this variable by adding it to a text string.

I do

prov_str=str(prov)

and he will not let me, the error is:

TypeError: 'str' object is not callable

I've done it many times and it always worked for me. use Python 3.6)