128055109 has 16 divisors (see below), whose sum is σ = 158287360. Its totient is φ = 100880640.

The previous prime is 128055091. The next prime is 128055143. The reversal of 128055109 is 901550821.

It is not a de Polignac number, because 128055109 - 2¹³ = 128046917 is a prime.

It is a super-2 number, since 2×128055109² = 32796221882003762, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128055209) 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, 19012 + ... + 24850.

It is an arithmetic number, because the mean of its divisors is an integer number (9892960).

Almost surely, 2^128055109 is an apocalyptic number.

It is an amenable number.

128055109 is a deficient number, since it is larger than the sum of its proper divisors (30232251).

128055109 is a wasteful number, since it uses less digits than its factorization.

128055109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6100.

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 128055109 is about 11316.1437336223. The cubic root of 128055109 is about 504.0407356111.

It can be divided in two parts, 128055 and 109, that added together give a square (128164 = 358²).

The spelling of 128055109 in words is "one hundred twenty-eight million, fifty-five thousand, one hundred nine".