128819131 has 8 divisors (see below), whose sum is σ = 152298720. Its totient is φ = 106608768.

The previous prime is 128819123. The next prime is 128819153. The reversal of 128819131 is 131918821.

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 128819131 - 2³ = 128819123 is a prime.

It is a super-2 number, since 2×128819131² = 33188737023190322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128819161) 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, 317086 + ... + 317491.

It is an arithmetic number, because the mean of its divisors is an integer number (19037340).

Almost surely, 2^128819131 is an apocalyptic number.

128819131 is a deficient number, since it is larger than the sum of its proper divisors (23479589).

128819131 is an equidigital number, since it uses as much as digits as its factorization.

128819131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634613.

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

The square root of 128819131 is about 11349.8515849327. The cubic root of 128819131 is about 505.0411769188.

The spelling of 128819131 in words is "one hundred twenty-eight million, eight hundred nineteen thousand, one hundred thirty-one".