19239765137 has 2 divisors, whose sum is σ = 19239765138. Its totient is φ = 19239765136.

The previous prime is 19239765119. The next prime is 19239765143. The reversal of 19239765137 is 73156793291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17730520336 + 1509244801 = 133156^2 + 38849^2 .

It is a cyclic number.

It is not a de Polignac number, because 19239765137 - 2¹⁰ = 19239764113 is a prime.

It is not a weakly prime, because it can be changed into another prime (19239765187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9619882568 + 9619882569.

It is an arithmetic number, because the mean of its divisors is an integer number (9619882569).

Almost surely, 2^19239765137 is an apocalyptic number.

It is an amenable number.

19239765137 is a deficient number, since it is larger than the sum of its proper divisors (1).

19239765137 is an equidigital number, since it uses as much as digits as its factorization.

19239765137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2143260, while the sum is 53.

The spelling of 19239765137 in words is "nineteen billion, two hundred thirty-nine million, seven hundred sixty-five thousand, one hundred thirty-seven".