19829000809 has 2 divisors, whose sum is σ = 19829000810. Its totient is φ = 19829000808.

The previous prime is 19829000791. The next prime is 19829000819. The reversal of 19829000809 is 90800092891.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14286942784 + 5542058025 = 119528^2 + 74445^2 .

It is an emirp because it is prime and its reverse (90800092891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19829000809 - 2⁹ = 19829000297 is a prime.

It is not a weakly prime, because it can be changed into another prime (19829000819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9914500404 + 9914500405.

It is an arithmetic number, because the mean of its divisors is an integer number (9914500405).

Almost surely, 2^19829000809 is an apocalyptic number.

It is an amenable number.

19829000809 is a deficient number, since it is larger than the sum of its proper divisors (1).

19829000809 is an equidigital number, since it uses as much as digits as its factorization.

19829000809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 46.

The spelling of 19829000809 in words is "nineteen billion, eight hundred twenty-nine million, eight hundred nine", and thus it is an aban number.