11231111 has 2 divisors, whose sum is σ = 11231112. Its totient is φ = 11231110.

The previous prime is 11231093. The next prime is 11231119. The reversal of 11231111 is 11113211.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11231111 - 2⁶ = 11231047 is a prime.

It is a super-2 number, since 2×11231111² = 252275708588642, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 11231092 and 11231101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11231119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5615555 + 5615556.

It is an arithmetic number, because the mean of its divisors is an integer number (5615556).

Almost surely, 2^11231111 is an apocalyptic number.

11231111 is a deficient number, since it is larger than the sum of its proper divisors (1).

11231111 is an equidigital number, since it uses as much as digits as its factorization.

11231111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6, while the sum is 11.

The square root of 11231111 is about 3351.2849774378. The cubic root of 11231111 is about 223.9447607731.

Adding to 11231111 its reverse (11113211), we get a palindrome (22344322).

The spelling of 11231111 in words is "eleven million, two hundred thirty-one thousand, one hundred eleven".