194002907191 has 4 divisors (see below), whose sum is σ = 194347495512. Its totient is φ = 193658318872.

The previous prime is 194002907173. The next prime is 194002907201. The reversal of 194002907191 is 191709200491.

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-194002907191 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 (194002907491) 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, 172293316 + ... + 172294441.

It is an arithmetic number, because the mean of its divisors is an integer number (48586873878).

Almost surely, 2^194002907191 is an apocalyptic number.

194002907191 is a deficient number, since it is larger than the sum of its proper divisors (344588321).

194002907191 is an equidigital number, since it uses as much as digits as its factorization.

194002907191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344588320.

The product of its (nonzero) digits is 40824, while the sum is 43.

The spelling of 194002907191 in words is "one hundred ninety-four billion, two million, nine hundred seven thousand, one hundred ninety-one".