1111312111 has 16 divisors (see below), whose sum is σ = 1395688000. Its totient is φ = 879276384.

The previous prime is 1111312073. The next prime is 1111312127. The reversal of 1111312111 is 1112131111.

It is not a de Polignac number, because 1111312111 - 2¹¹ = 1111310063 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 1111312091 and 1111312100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111312171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120156 + ... + 129073.

It is an arithmetic number, because the mean of its divisors is an integer number (87230500).

Almost surely, 2^1111312111 is an apocalyptic number.

1111312111 is a deficient number, since it is larger than the sum of its proper divisors (284375889).

1111312111 is an equidigital number, since it uses as much as digits as its factorization.

1111312111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249263 (or 249249 counting only the distinct ones).

The product of its digits is 6, while the sum is 13.

The square root of 1111312111 is about 33336.3481953258. The cubic root of 1111312111 is about 1035.8066202245.

Adding to 1111312111 its reverse (1112131111), we get a palindrome (2223443222).

The spelling of 1111312111 in words is "one billion, one hundred eleven million, three hundred twelve thousand, one hundred eleven".