19091097389489 has 2 divisors, whose sum is σ = 19091097389490. Its totient is φ = 19091097389488.

The previous prime is 19091097389453. The next prime is 19091097389591. The reversal of 19091097389489 is 98498379019091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10786856392225 + 8304240997264 = 3284335^2 + 2881708^2 .

It is an emirp because it is prime and its reverse (98498379019091) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19091097389489 is a prime.

It is a super-3 number, since 3×19091097389489³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (19091097289489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9545548694744 + 9545548694745.

It is an arithmetic number, because the mean of its divisors is an integer number (9545548694745).

Almost surely, 2^{19091097389489} is an apocalyptic number.

It is an amenable number.

19091097389489 is a deficient number, since it is larger than the sum of its proper divisors (1).

19091097389489 is an equidigital number, since it uses as much as digits as its factorization.

19091097389489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 317447424, while the sum is 77.

The spelling of 19091097389489 in words is "nineteen trillion, ninety-one billion, ninety-seven million, three hundred eighty-nine thousand, four hundred eighty-nine".