19191838241 has 2 divisors, whose sum is σ = 19191838242. Its totient is φ = 19191838240.

The previous prime is 19191838199. The next prime is 19191838313. The reversal of 19191838241 is 14283819191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12165207616 + 7026630625 = 110296^2 + 83825^2 .

It is a cyclic number.

It is not a de Polignac number, because 19191838241 - 2³⁰ = 18118096417 is a prime.

It is not a weakly prime, because it can be changed into another prime (19191837241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9595919120 + 9595919121.

It is an arithmetic number, because the mean of its divisors is an integer number (9595919121).

Almost surely, 2^19191838241 is an apocalyptic number.

It is an amenable number.

19191838241 is a deficient number, since it is larger than the sum of its proper divisors (1).

19191838241 is an equidigital number, since it uses as much as digits as its factorization.

19191838241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 47.

The spelling of 19191838241 in words is "nineteen billion, one hundred ninety-one million, eight hundred thirty-eight thousand, two hundred forty-one".