191425189 has 2 divisors, whose sum is σ = 191425190. Its totient is φ = 191425188.

The previous prime is 191425163. The next prime is 191425243. The reversal of 191425189 is 981524191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 185422689 + 6002500 = 13617^2 + 2450^2 .

It is an emirp because it is prime and its reverse (981524191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 191425189 - 2⁷ = 191425061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191425139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95712594 + 95712595.

It is an arithmetic number, because the mean of its divisors is an integer number (95712595).

Almost surely, 2^191425189 is an apocalyptic number.

It is an amenable number.

191425189 is a deficient number, since it is larger than the sum of its proper divisors (1).

191425189 is an equidigital number, since it uses as much as digits as its factorization.

191425189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 40.

The square root of 191425189 is about 13835.6492077531. The cubic root of 191425189 is about 576.3235436743.

The spelling of 191425189 in words is "one hundred ninety-one million, four hundred twenty-five thousand, one hundred eighty-nine".