128200591 has 4 divisors (see below), whose sum is σ = 128462184. Its totient is φ = 127939000.

The previous prime is 128200577. The next prime is 128200601. The reversal of 128200591 is 195002821.

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 128200591 - 2⁵ = 128200559 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 (128200571) 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, 130060 + ... + 131041.

It is an arithmetic number, because the mean of its divisors is an integer number (32115546).

Almost surely, 2^128200591 is an apocalyptic number.

128200591 is a deficient number, since it is larger than the sum of its proper divisors (261593).

128200591 is an equidigital number, since it uses as much as digits as its factorization.

128200591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261592.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 128200591 is about 11322.5699821198. The cubic root of 128200591 is about 504.2315417492.

The spelling of 128200591 in words is "one hundred twenty-eight million, two hundred thousand, five hundred ninety-one".