128671199 has 4 divisors (see below), whose sum is σ = 129016536. Its totient is φ = 128325864.

The previous prime is 128671189. The next prime is 128671217. The reversal of 128671199 is 991176821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 991176821 = 7057 ⋅140453.

It is a cyclic number.

It is not a de Polignac number, because 128671199 - 2⁴ = 128671183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128671139) 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, 172109 + ... + 172854.

It is an arithmetic number, because the mean of its divisors is an integer number (32254134).

Almost surely, 2^128671199 is an apocalyptic number.

128671199 is a deficient number, since it is larger than the sum of its proper divisors (345337).

128671199 is an equidigital number, since it uses as much as digits as its factorization.

128671199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345336.

The product of its digits is 54432, while the sum is 44.

The square root of 128671199 is about 11343.3327994906. The cubic root of 128671199 is about 504.8477781900.

The spelling of 128671199 in words is "one hundred twenty-eight million, six hundred seventy-one thousand, one hundred ninety-nine".