191822722457 has 2 divisors, whose sum is σ = 191822722458. Its totient is φ = 191822722456.

The previous prime is 191822722363. The next prime is 191822722463. The reversal of 191822722457 is 754227228191.

It is a happy number.

191822722457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96897728656 + 94924993801 = 311284^2 + 308099^2 .

It is an emirp because it is prime and its reverse (754227228191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 191822722457 - 2¹² = 191822718361 is a prime.

It is not a weakly prime, because it can be changed into another prime (191822722757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95911361228 + 95911361229.

It is an arithmetic number, because the mean of its divisors is an integer number (95911361229).

Almost surely, 2^191822722457 is an apocalyptic number.

It is an amenable number.

191822722457 is a deficient number, since it is larger than the sum of its proper divisors (1).

191822722457 is an equidigital number, since it uses as much as digits as its factorization.

191822722457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1128960, while the sum is 50.

The spelling of 191822722457 in words is "one hundred ninety-one billion, eight hundred twenty-two million, seven hundred twenty-two thousand, four hundred fifty-seven".