128181139 has 8 divisors (see below), whose sum is σ = 141622560. Its totient is φ = 115395456.

The previous prime is 128181107. The next prime is 128181161. The reversal of 128181139 is 931181821.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128181139 - 2⁵ = 128181107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128182139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163524 + ... + 164305.

It is an arithmetic number, because the mean of its divisors is an integer number (17702820).

Almost surely, 2^128181139 is an apocalyptic number.

128181139 is a deficient number, since it is larger than the sum of its proper divisors (13441421).

128181139 is a wasteful number, since it uses less digits than its factorization.

128181139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327869.

The product of its digits is 3456, while the sum is 34.

The square root of 128181139 is about 11321.7109572714. The cubic root of 128181139 is about 504.2060379456.

The spelling of 128181139 in words is "one hundred twenty-eight million, one hundred eighty-one thousand, one hundred thirty-nine".