19091120385541 has 2 divisors, whose sum is σ = 19091120385542. Its totient is φ = 19091120385540.

The previous prime is 19091120385473. The next prime is 19091120385607. The reversal of 19091120385541 is 14558302119091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11447084289316 + 7644036096225 = 3383354^2 + 2764785^2 .

It is a cyclic number.

It is not a de Polignac number, because 19091120385541 - 2⁷ = 19091120385413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19091120385341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9545560192770 + 9545560192771.

It is an arithmetic number, because the mean of its divisors is an integer number (9545560192771).

Almost surely, 2^{19091120385541} is an apocalyptic number.

It is an amenable number.

19091120385541 is a deficient number, since it is larger than the sum of its proper divisors (1).

19091120385541 is an equidigital number, since it uses as much as digits as its factorization.

19091120385541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 388800, while the sum is 49.

The spelling of 19091120385541 in words is "nineteen trillion, ninety-one billion, one hundred twenty million, three hundred eighty-five thousand, five hundred forty-one".