191328201 has 6 divisors (see below), whose sum is σ = 276362970. Its totient is φ = 127552128.

The previous prime is 191328169. The next prime is 191328229. The reversal of 191328201 is 102823191.

It can be written as a sum of positive squares in only one way, i.e., 189778176 + 1550025 = 13776^2 + 1245^2 .

It is not a de Polignac number, because 191328201 - 2⁵ = 191328169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (191328101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10629336 + ... + 10629353.

It is an arithmetic number, because the mean of its divisors is an integer number (46060495).

Almost surely, 2^191328201 is an apocalyptic number.

It is an amenable number.

191328201 is a deficient number, since it is larger than the sum of its proper divisors (85034769).

191328201 is a wasteful number, since it uses less digits than its factorization.

191328201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21258695 (or 21258692 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 191328201 is about 13832.1437600973. The cubic root of 191328201 is about 576.2261933534.

The spelling of 191328201 in words is "one hundred ninety-one million, three hundred twenty-eight thousand, two hundred one".