11010100991 has 2 divisors, whose sum is σ = 11010100992. Its totient is φ = 11010100990.

The previous prime is 11010100961. The next prime is 11010101041. The reversal of 11010100991 is 19900101011.

It is a happy number.

11010100991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11010100991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11010100921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5505050495 + 5505050496.

It is an arithmetic number, because the mean of its divisors is an integer number (5505050496).

Almost surely, 2^11010100991 is an apocalyptic number.

11010100991 is a deficient number, since it is larger than the sum of its proper divisors (1).

11010100991 is an equidigital number, since it uses as much as digits as its factorization.

11010100991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81, while the sum is 23.

The spelling of 11010100991 in words is "eleven billion, ten million, one hundred thousand, nine hundred ninety-one".