1111222111 has 8 divisors (see below), whose sum is σ = 1114848000. Its totient is φ = 1107603288.

The previous prime is 1111222097. The next prime is 1111222117. The reversal of 1111222111 is 1112221111.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1111222111 - 2¹⁷ = 1111091039 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 1111222091 and 1111222100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111222117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 554890 + ... + 556888.

It is an arithmetic number, because the mean of its divisors is an integer number (139356000).

Almost surely, 2^1111222111 is an apocalyptic number.

1111222111 is a deficient number, since it is larger than the sum of its proper divisors (3625889).

1111222111 is an equidigital number, since it uses as much as digits as its factorization.

1111222111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3533.

The product of its digits is 8, while the sum is 13.

The square root of 1111222111 is about 33334.9982900855. The cubic root of 1111222111 is about 1035.7786577491.

Adding to 1111222111 its reverse (1112221111), we get a palindrome (2223443222).

The spelling of 1111222111 in words is "one billion, one hundred eleven million, two hundred twenty-two thousand, one hundred eleven".