135428109 has 4 divisors (see below), whose sum is σ = 180570816. Its totient is φ = 90285404.

The previous prime is 135428107. The next prime is 135428129. The reversal of 135428109 is 901824531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 135428109 - 2¹ = 135428107 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 135428109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135428107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22571349 + ... + 22571354.

It is an arithmetic number, because the mean of its divisors is an integer number (45142704).

Almost surely, 2^135428109 is an apocalyptic number.

It is an amenable number.

135428109 is a deficient number, since it is larger than the sum of its proper divisors (45142707).

135428109 is an equidigital number, since it uses as much as digits as its factorization.

135428109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45142706.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 135428109 is about 11637.3583342613. The cubic root of 135428109 is about 513.5344755781.

The spelling of 135428109 in words is "one hundred thirty-five million, four hundred twenty-eight thousand, one hundred nine".