1121111111 has 2 divisors, whose sum is σ = 1121111112. Its totient is φ = 1121111110.

The previous prime is 1121111083. The next prime is 1121111119. The reversal of 1121111111 is 1111111211.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1121111111 - 2¹⁰ = 1121110087 is a prime.

1121111111 is a modest number, since divided by 111111 gives 1121 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 1121111092 and 1121111101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121111119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560555555 + 560555556.

It is an arithmetic number, because the mean of its divisors is an integer number (560555556).

Almost surely, 2^1121111111 is an apocalyptic number.

1121111111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121111111 is an equidigital number, since it uses as much as digits as its factorization.

1121111111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2, while the sum is 11.

The square root of 1121111111 is about 33482.9973419346. The cubic root of 1121111111 is about 1038.8421257561.

Adding to 1121111111 its reverse (1111111211), we get a palindrome (2232222322).

It can be divided in two parts, 11211 and 11111, that multiplied together give a palindrome (124565421).

The spelling of 1121111111 in words is "one billion, one hundred twenty-one million, one hundred eleven thousand, one hundred eleven".