1098999998909 has 2 divisors, whose sum is σ = 1098999998910. Its totient is φ = 1098999998908.

The previous prime is 1098999998821. The next prime is 1098999998917. The reversal of 1098999998909 is 9098999998901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 750610838884 + 348389160025 = 866378^2 + 590245^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1098999998909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1098999998209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 549499999454 + 549499999455.

It is an arithmetic number, because the mean of its divisors is an integer number (549499999455).

Almost surely, 2^{1098999998909} is an apocalyptic number.

It is an amenable number.

1098999998909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1098999998909 is an equidigital number, since it uses as much as digits as its factorization.

1098999998909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2754990144, while the sum is 89.

The spelling of 1098999998909 in words is "one trillion, ninety-eight billion, nine hundred ninety-nine million, nine hundred ninety-eight thousand, nine hundred nine".