11011010100991 has 2 divisors, whose sum is σ = 11011010100992. Its totient is φ = 11011010100990.

The previous prime is 11011010100877. The next prime is 11011010100997. The reversal of 11011010100991 is 19900101011011.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11011010100991 - 2²⁷ = 11010875883263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11011010100997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5505505050495 + 5505505050496.

It is an arithmetic number, because the mean of its divisors is an integer number (5505505050496).

Almost surely, 2^{11011010100991} is an apocalyptic number.

11011010100991 is a deficient number, since it is larger than the sum of its proper divisors (1).

11011010100991 is an equidigital number, since it uses as much as digits as its factorization.

11011010100991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81, while the sum is 25.

The spelling of 11011010100991 in words is "eleven trillion, eleven billion, ten million, one hundred thousand, nine hundred ninety-one".