1091000019911 has 2 divisors, whose sum is σ = 1091000019912. Its totient is φ = 1091000019910.

The previous prime is 1091000019859. The next prime is 1091000019913. The reversal of 1091000019911 is 1199100001901.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1091000019911 - 2¹⁸ = 1090999757767 is a prime.

Together with 1091000019913, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1091000019913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545500009955 + 545500009956.

It is an arithmetic number, because the mean of its divisors is an integer number (545500009956).

Almost surely, 2^{1091000019911} is an apocalyptic number.

1091000019911 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091000019911 is an equidigital number, since it uses as much as digits as its factorization.

1091000019911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 729, while the sum is 32.

The spelling of 1091000019911 in words is "one trillion, ninety-one billion, nineteen thousand, nine hundred eleven".