128617199 has 4 divisors (see below), whose sum is σ = 128648520. Its totient is φ = 128585880.

The previous prime is 128617183. The next prime is 128617201. The reversal of 128617199 is 991716821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128617199 - 2⁴ = 128617183 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 (128617129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8369 + ... + 18090.

It is an arithmetic number, because the mean of its divisors is an integer number (32162130).

Almost surely, 2^128617199 is an apocalyptic number.

128617199 is a deficient number, since it is larger than the sum of its proper divisors (31321).

128617199 is an equidigital number, since it uses as much as digits as its factorization.

128617199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31320.

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

The square root of 128617199 is about 11340.9522968752. The cubic root of 128617199 is about 504.7771444227. Note that the first 3 decimals are identical.

The spelling of 128617199 in words is "one hundred twenty-eight million, six hundred seventeen thousand, one hundred ninety-nine".