19268231909 has 2 divisors, whose sum is σ = 19268231910. Its totient is φ = 19268231908.

The previous prime is 19268231897. The next prime is 19268231963. The reversal of 19268231909 is 90913286291.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18819724225 + 448507684 = 137185^2 + 21178^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19268231909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19268236909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9634115954 + 9634115955.

It is an arithmetic number, because the mean of its divisors is an integer number (9634115955).

Almost surely, 2^19268231909 is an apocalyptic number.

It is an amenable number.

19268231909 is a deficient number, since it is larger than the sum of its proper divisors (1).

19268231909 is an equidigital number, since it uses as much as digits as its factorization.

19268231909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 419904, while the sum is 50.

The spelling of 19268231909 in words is "nineteen billion, two hundred sixty-eight million, two hundred thirty-one thousand, nine hundred nine".