191890395194 has 8 divisors (see below), whose sum is σ = 287872269300. Its totient is φ = 95932972096.

The previous prime is 191890395143. The next prime is 191890395197. The reversal of 191890395194 is 491593098191.

It can be written as a sum of positive squares in 2 ways, for example, as 184397242225 + 7493152969 = 429415^2 + 86563^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (191890395197) 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, 6093119 + ... + 6124530.

Almost surely, 2^191890395194 is an apocalyptic number.

191890395194 is a deficient number, since it is larger than the sum of its proper divisors (95981874106).

191890395194 is a wasteful number, since it uses less digits than its factorization.

191890395194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12225504.

The product of its (nonzero) digits is 3149280, while the sum is 59.

The spelling of 191890395194 in words is "one hundred ninety-one billion, eight hundred ninety million, three hundred ninety-five thousand, one hundred ninety-four".