195471328391 has 4 divisors (see below), whose sum is σ = 195863055000. Its totient is φ = 195079601784.

The previous prime is 195471328379. The next prime is 195471328411. The reversal of 195471328391 is 193823174591.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195471328391 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 (195471928391) 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, 195862556 + ... + 195863553.

It is an arithmetic number, because the mean of its divisors is an integer number (48965763750).

Almost surely, 2^195471328391 is an apocalyptic number.

195471328391 is a deficient number, since it is larger than the sum of its proper divisors (391726609).

195471328391 is an equidigital number, since it uses as much as digits as its factorization.

195471328391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391726608.

The product of its digits is 1632960, while the sum is 53.

The spelling of 195471328391 in words is "one hundred ninety-five billion, four hundred seventy-one million, three hundred twenty-eight thousand, three hundred ninety-one".