189395328391 has 2 divisors, whose sum is σ = 189395328392. Its totient is φ = 189395328390.

The previous prime is 189395328361. The next prime is 189395328503. The reversal of 189395328391 is 193823593981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 189395328391 - 2²³ = 189386939783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189395328361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94697664195 + 94697664196.

It is an arithmetic number, because the mean of its divisors is an integer number (94697664196).

Almost surely, 2^189395328391 is an apocalyptic number.

189395328391 is a deficient number, since it is larger than the sum of its proper divisors (1).

189395328391 is an equidigital number, since it uses as much as digits as its factorization.

189395328391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12597120, while the sum is 61.

The spelling of 189395328391 in words is "one hundred eighty-nine billion, three hundred ninety-five million, three hundred twenty-eight thousand, three hundred ninety-one".