2111111791 has 2 divisors, whose sum is σ = 2111111792. Its totient is φ = 2111111790.

The previous prime is 2111111713. The next prime is 2111111837. The reversal of 2111111791 is 1971111112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2111111791 - 2¹¹ = 2111109743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2111111291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055555895 + 1055555896.

It is an arithmetic number, because the mean of its divisors is an integer number (1055555896).

Almost surely, 2^2111111791 is an apocalyptic number.

2111111791 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111111791 is an equidigital number, since it uses as much as digits as its factorization.

2111111791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 126, while the sum is 25.

The square root of 2111111791 is about 45946.8365722821. The cubic root of 2111111791 is about 1282.8338481389.

The spelling of 2111111791 in words is "two billion, one hundred eleven million, one hundred eleven thousand, seven hundred ninety-one".