191012219 has 2 divisors, whose sum is σ = 191012220. Its totient is φ = 191012218.

The previous prime is 191012209. The next prime is 191012249. The reversal of 191012219 is 912210191.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 191012219 - 2²⁰ = 189963643 is a prime.

It is a super-2 number, since 2×191012219² = 72971335614607922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (191012209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95506109 + 95506110.

It is an arithmetic number, because the mean of its divisors is an integer number (95506110).

Almost surely, 2^191012219 is an apocalyptic number.

191012219 is a deficient number, since it is larger than the sum of its proper divisors (1).

191012219 is an equidigital number, since it uses as much as digits as its factorization.

191012219 is an odious number, because the sum of its binary digits is odd.

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

The square root of 191012219 is about 13820.7170219204. The cubic root of 191012219 is about 575.9088025546.

The spelling of 191012219 in words is "one hundred ninety-one million, twelve thousand, two hundred nineteen".