191139189 has 4 divisors (see below), whose sum is σ = 254852256. Its totient is φ = 127426124.

The previous prime is 191139181. The next prime is 191139217. The reversal of 191139189 is 981931191.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 191139189 - 2³ = 191139181 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 191139189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191139181) 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, 31856529 + ... + 31856534.

It is an arithmetic number, because the mean of its divisors is an integer number (63713064).

Almost surely, 2^191139189 is an apocalyptic number.

It is an amenable number.

191139189 is a deficient number, since it is larger than the sum of its proper divisors (63713067).

191139189 is an equidigital number, since it uses as much as digits as its factorization.

191139189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63713066.

The product of its digits is 17496, while the sum is 42.

The square root of 191139189 is about 13825.3097252828. The cubic root of 191139189 is about 576.0363806834.

The spelling of 191139189 in words is "one hundred ninety-one million, one hundred thirty-nine thousand, one hundred eighty-nine".