191609450191 has 16 divisors (see below), whose sum is σ = 193759568640. Its totient is φ = 189474611200.

The previous prime is 191609450189. The next prime is 191609450213. The reversal of 191609450191 is 191054906191.

It is a cyclic number.

It is not a de Polignac number, because 191609450191 - 2¹ = 191609450189 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 (191609450101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24247341 + ... + 24255241.

It is an arithmetic number, because the mean of its divisors is an integer number (12109973040).

Almost surely, 2^191609450191 is an apocalyptic number.

191609450191 is a deficient number, since it is larger than the sum of its proper divisors (2150118449).

191609450191 is a wasteful number, since it uses less digits than its factorization.

191609450191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8834.

The product of its (nonzero) digits is 87480, while the sum is 46.

The spelling of 191609450191 in words is "one hundred ninety-one billion, six hundred nine million, four hundred fifty thousand, one hundred ninety-one".