191322813138637 has 2 divisors, whose sum is σ = 191322813138638. Its totient is φ = 191322813138636.

The previous prime is 191322813138547. The next prime is 191322813138707. The reversal of 191322813138637 is 736831318223191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191322813138601 + 36 = 13831949^2 + 6^2 .

It is a cyclic number.

It is not a de Polignac number, because 191322813138637 - 2²³ = 191322804750029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191322813133637) 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, 95661406569318 + 95661406569319.

It is an arithmetic number, because the mean of its divisors is an integer number (95661406569319).

Almost surely, 2^{191322813138637} is an apocalyptic number.

It is an amenable number.

191322813138637 is a deficient number, since it is larger than the sum of its proper divisors (1).

191322813138637 is an equidigital number, since it uses as much as digits as its factorization.

191322813138637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7838208, while the sum is 58.

The spelling of 191322813138637 in words is "one hundred ninety-one trillion, three hundred twenty-two billion, eight hundred thirteen million, one hundred thirty-eight thousand, six hundred thirty-seven".