19503798137 has 2 divisors, whose sum is σ = 19503798138. Its totient is φ = 19503798136.

The previous prime is 19503798133. The next prime is 19503798151. The reversal of 19503798137 is 73189730591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17548035961 + 1955762176 = 132469^2 + 44224^2 .

It is an emirp because it is prime and its reverse (73189730591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19503798137 - 2² = 19503798133 is a prime.

It is not a weakly prime, because it can be changed into another prime (19503798133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9751899068 + 9751899069.

It is an arithmetic number, because the mean of its divisors is an integer number (9751899069).

Almost surely, 2^19503798137 is an apocalyptic number.

It is an amenable number.

19503798137 is a deficient number, since it is larger than the sum of its proper divisors (1).

19503798137 is an equidigital number, since it uses as much as digits as its factorization.

19503798137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1428840, while the sum is 53.

The spelling of 19503798137 in words is "nineteen billion, five hundred three million, seven hundred ninety-eight thousand, one hundred thirty-seven".