1011111102809 has 2 divisors, whose sum is σ = 1011111102810. Its totient is φ = 1011111102808.

The previous prime is 1011111102803. The next prime is 1011111102823. The reversal of 1011111102809 is 9082011111101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 926592984409 + 84518118400 = 962597^2 + 290720^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1011111102809 is a prime.

It is not a weakly prime, because it can be changed into another prime (1011111102803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505555551404 + 505555551405.

It is an arithmetic number, because the mean of its divisors is an integer number (505555551405).

Almost surely, 2^{1011111102809} is an apocalyptic number.

It is an amenable number.

1011111102809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011111102809 is an equidigital number, since it uses as much as digits as its factorization.

1011111102809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 26.

The spelling of 1011111102809 in words is "one trillion, eleven billion, one hundred eleven million, one hundred two thousand, eight hundred nine".