192120191 has 4 divisors (see below), whose sum is σ = 202231800. Its totient is φ = 182008584.

The previous prime is 192120167. The next prime is 192120193. The reversal of 192120191 is 191021291.

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-192120191 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 192120191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (192120193) 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, 5055776 + ... + 5055813.

It is an arithmetic number, because the mean of its divisors is an integer number (50557950).

Almost surely, 2^192120191 is an apocalyptic number.

192120191 is a deficient number, since it is larger than the sum of its proper divisors (10111609).

192120191 is a wasteful number, since it uses less digits than its factorization.

192120191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10111608.

The product of its (nonzero) digits is 324, while the sum is 26.

The square root of 192120191 is about 13860.7428011633. The cubic root of 192120191 is about 577.0201817754.

The spelling of 192120191 in words is "one hundred ninety-two million, one hundred twenty thousand, one hundred ninety-one".