1011111211291 has 2 divisors, whose sum is σ = 1011111211292. Its totient is φ = 1011111211290.

The previous prime is 1011111211199. The next prime is 1011111211301. The reversal of 1011111211291 is 1921121111101.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1011111211291 - 2⁷ = 1011111211163 is a prime.

It is not a weakly prime, because it can be changed into another prime (1011111214291) 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, 505555605645 + 505555605646.

It is an arithmetic number, because the mean of its divisors is an integer number (505555605646).

Almost surely, 2^{1011111211291} is an apocalyptic number.

1011111211291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011111211291 is an equidigital number, since it uses as much as digits as its factorization.

1011111211291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 22.

Adding to 1011111211291 its reverse (1921121111101), we get a palindrome (2932232322392).

The spelling of 1011111211291 in words is "one trillion, eleven billion, one hundred eleven million, two hundred eleven thousand, two hundred ninety-one".