1109192941991 has 2 divisors, whose sum is σ = 1109192941992. Its totient is φ = 1109192941990.

The previous prime is 1109192941943. The next prime is 1109192941993. The reversal of 1109192941991 is 1991492919011.

It is a strong prime.

It is an emirp because it is prime and its reverse (1991492919011) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1109192941991 is a prime.

It is a Sophie Germain prime.

Together with 1109192941993, 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 (1109192941993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 554596470995 + 554596470996.

It is an arithmetic number, because the mean of its divisors is an integer number (554596470996).

Almost surely, 2^{1109192941991} is an apocalyptic number.

1109192941991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1109192941991 is an equidigital number, since it uses as much as digits as its factorization.

1109192941991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 472392, while the sum is 56.

The spelling of 1109192941991 in words is "one trillion, one hundred nine billion, one hundred ninety-two million, nine hundred forty-one thousand, nine hundred ninety-one".