35

is the integer between.

Math features

 * 35 is an odd number.
 * 35 is a deficient number and is a semiprime.
 * 35 is a composite number.
 * 35 is 1 less than a square number. Therefore it is also the product of 2 consecutive numbers, which in this case, are prime numbers.
 * The sum of the squares of the digits of 35 are 3² + 5², which is one less than 35, 34.