191142489719 has 2 divisors, whose sum is σ = 191142489720. Its totient is φ = 191142489718.

The previous prime is 191142489709. The next prime is 191142489737. The reversal of 191142489719 is 917984241191.

It is a weak prime.

It is an emirp because it is prime and its reverse (917984241191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 191142489719 - 2²⁸ = 190874054263 is a prime.

It is a super-2 number, since 2×191142489719² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191142489709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95571244859 + 95571244860.

It is an arithmetic number, because the mean of its divisors is an integer number (95571244860).

Almost surely, 2^191142489719 is an apocalyptic number.

191142489719 is a deficient number, since it is larger than the sum of its proper divisors (1).

191142489719 is an equidigital number, since it uses as much as digits as its factorization.

191142489719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 56.

The spelling of 191142489719 in words is "one hundred ninety-one billion, one hundred forty-two million, four hundred eighty-nine thousand, seven hundred nineteen".