128081919 has 8 divisors (see below), whose sum is σ = 195172480. Its totient is φ = 73189656.

The previous prime is 128081911. The next prime is 128081923. The reversal of 128081919 is 919180821.

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

It is not a de Polignac number, because 128081919 - 2³ = 128081911 is a prime.

It is a super-2 number, since 2×128081919² = 32809955949445122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128081911) 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, 3049549 + ... + 3049590.

It is an arithmetic number, because the mean of its divisors is an integer number (24396560).

Almost surely, 2^128081919 is an apocalyptic number.

128081919 is a deficient number, since it is larger than the sum of its proper divisors (67090561).

128081919 is an equidigital number, since it uses as much as digits as its factorization.

128081919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6099149.

The product of its (nonzero) digits is 10368, while the sum is 39.

The square root of 128081919 is about 11317.3282624478. The cubic root of 128081919 is about 504.0759089810.

The spelling of 128081919 in words is "one hundred twenty-eight million, eighty-one thousand, nine hundred nineteen".