2011111231 has 2 divisors, whose sum is σ = 2011111232. Its totient is φ = 2011111230.

The previous prime is 2011111181. The next prime is 2011111261. The reversal of 2011111231 is 1321111102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2011111231 - 2⁷ = 2011111103 is a prime.

It is a super-2 number, since 2×2011111231² = 8089136766908670722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2011111261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1005555615 + 1005555616.

It is an arithmetic number, because the mean of its divisors is an integer number (1005555616).

Almost surely, 2^2011111231 is an apocalyptic number.

2011111231 is a deficient number, since it is larger than the sum of its proper divisors (1).

2011111231 is an equidigital number, since it uses as much as digits as its factorization.

2011111231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 2011111231 is about 44845.4148269363. The cubic root of 2011111231 is about 1262.2499546760.

Adding to 2011111231 its reverse (1321111102), we get a palindrome (3332222333).

The spelling of 2011111231 in words is "two billion, eleven million, one hundred eleven thousand, two hundred thirty-one".