11011111001911 has 2 divisors, whose sum is σ = 11011111001912. Its totient is φ = 11011111001910.

The previous prime is 11011111001861. The next prime is 11011111001999. The reversal of 11011111001911 is 11910011111011.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11011111001911 - 2⁷ = 11011111001783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11011111041911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5505555500955 + 5505555500956.

It is an arithmetic number, because the mean of its divisors is an integer number (5505555500956).

Almost surely, 2^{11011111001911} is an apocalyptic number.

11011111001911 is a deficient number, since it is larger than the sum of its proper divisors (1).

11011111001911 is an equidigital number, since it uses as much as digits as its factorization.

11011111001911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9, while the sum is 19.

Adding to 11011111001911 its reverse (11910011111011), we get a palindrome (22921122112922).

The spelling of 11011111001911 in words is "eleven trillion, eleven billion, one hundred eleven million, one thousand, nine hundred eleven".