1091919191911 has 2 divisors, whose sum is σ = 1091919191912. Its totient is φ = 1091919191910.

The previous prime is 1091919191899. The next prime is 1091919191921. The reversal of 1091919191911 is 1191919191901.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1091919191911 - 2¹⁷ = 1091919060839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1091919191921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545959595955 + 545959595956.

It is an arithmetic number, because the mean of its divisors is an integer number (545959595956).

Almost surely, 2^{1091919191911} is an apocalyptic number.

1091919191911 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091919191911 is an equidigital number, since it uses as much as digits as its factorization.

1091919191911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 59049, while the sum is 52.

The spelling of 1091919191911 in words is "one trillion, ninety-one billion, nine hundred nineteen million, one hundred ninety-one thousand, nine hundred eleven".