128199199 has 4 divisors (see below), whose sum is σ = 129468600. Its totient is φ = 126929800.

The previous prime is 128199187. The next prime is 128199241. The reversal of 128199199 is 991991821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 991991821 = 61 ⋅16262161.

It is a cyclic number.

It is not a de Polignac number, because 128199199 - 2⁹ = 128198687 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 (128199109) 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, 634549 + ... + 634750.

It is an arithmetic number, because the mean of its divisors is an integer number (32367150).

Almost surely, 2^128199199 is an apocalyptic number.

128199199 is a deficient number, since it is larger than the sum of its proper divisors (1269401).

128199199 is a wasteful number, since it uses less digits than its factorization.

128199199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1269400.

The product of its digits is 104976, while the sum is 49.

The square root of 128199199 is about 11322.5085118096. The cubic root of 128199199 is about 504.2297167632.

The spelling of 128199199 in words is "one hundred twenty-eight million, one hundred ninety-nine thousand, one hundred ninety-nine".