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The range of values for integers in Emacs Lisp is −536870912 to
536870911 (30 bits; i.e.,
-2**29
to
2**29 − 1)
on typical 32-bit machines. (Some machines provide a wider range.)
Emacs Lisp arithmetic functions do not check for overflow. Thus
`(1+ 536870911)`

is −536870912 if Emacs integers are 30 bits.

The read syntax for integers is a sequence of (base ten) digits with an
optional sign at the beginning and an optional period at the end. The
printed representation produced by the Lisp interpreter never has a
leading ‘`+`’ or a final ‘`.`’.

-1 ; The integer -1. 1 ; The integer 1. 1. ; Also the integer 1. +1 ; Also the integer 1.

As a special exception, if a sequence of digits specifies an integer
too large or too small to be a valid integer object, the Lisp reader
reads it as a floating-point number (see Floating Point Type).
For instance, if Emacs integers are 30 bits, `536870912`

is read
as the floating-point number `536870912.0`

.

See Numbers, for more information.