19239768109 has 2 divisors, whose sum is σ = 19239768110. Its totient is φ = 19239768108.

The previous prime is 19239768103. The next prime is 19239768113. The reversal of 19239768109 is 90186793291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10982411209 + 8257356900 = 104797^2 + 90870^2 .

It is a cyclic number.

It is not a de Polignac number, because 19239768109 - 2⁵ = 19239768077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19239768109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19239768103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9619884054 + 9619884055.

It is an arithmetic number, because the mean of its divisors is an integer number (9619884055).

Almost surely, 2^19239768109 is an apocalyptic number.

It is an amenable number.

19239768109 is a deficient number, since it is larger than the sum of its proper divisors (1).

19239768109 is an equidigital number, since it uses as much as digits as its factorization.

19239768109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1469664, while the sum is 55.

The spelling of 19239768109 in words is "nineteen billion, two hundred thirty-nine million, seven hundred sixty-eight thousand, one hundred nine".