189601578091 has 2 divisors, whose sum is σ = 189601578092. Its totient is φ = 189601578090.

The previous prime is 189601578077. The next prime is 189601578143. The reversal of 189601578091 is 190875106981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 189601578091 - 2⁹ = 189601577579 is a prime.

It is not a weakly prime, because it can be changed into another prime (189601578191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94800789045 + 94800789046.

It is an arithmetic number, because the mean of its divisors is an integer number (94800789046).

Almost surely, 2^189601578091 is an apocalyptic number.

189601578091 is a deficient number, since it is larger than the sum of its proper divisors (1).

189601578091 is an equidigital number, since it uses as much as digits as its factorization.

189601578091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 55.

The spelling of 189601578091 in words is "one hundred eighty-nine billion, six hundred one million, five hundred seventy-eight thousand, ninety-one".