135128871 has 16 divisors (see below), whose sum is σ = 201246720. Its totient is φ = 89610840.

The previous prime is 135128867. The next prime is 135128923. The reversal of 135128871 is 178821531.

135128871 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 135128871 - 2² = 135128867 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135128471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7945 + ... + 18258.

It is an arithmetic number, because the mean of its divisors is an integer number (12577920).

Almost surely, 2^135128871 is an apocalyptic number.

135128871 is a deficient number, since it is larger than the sum of its proper divisors (66117849).

135128871 is a wasteful number, since it uses less digits than its factorization.

135128871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26403 (or 26397 counting only the distinct ones).

The product of its digits is 13440, while the sum is 36.

The square root of 135128871 is about 11624.4944406198. The cubic root of 135128871 is about 513.1559663933.

The spelling of 135128871 in words is "one hundred thirty-five million, one hundred twenty-eight thousand, eight hundred seventy-one".