1131222111 has 16 divisors (see below), whose sum is σ = 1566552960. Its totient is φ = 725228000.

The previous prime is 1131222101. The next prime is 1131222151. The reversal of 1131222111 is 1112221311.

It is a cyclic number.

It is not a de Polignac number, because 1131222111 - 2¹⁹ = 1130697823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131222101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4065 + ... + 47738.

It is an arithmetic number, because the mean of its divisors is an integer number (97909560).

Almost surely, 2^1131222111 is an apocalyptic number.

1131222111 is a deficient number, since it is larger than the sum of its proper divisors (435330849).

1131222111 is a wasteful number, since it uses less digits than its factorization.

1131222111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52086.

The product of its digits is 24, while the sum is 15.

The square root of 1131222111 is about 33633.6455205201. The cubic root of 1131222111 is about 1041.9557966839.

Adding to 1131222111 its reverse (1112221311), we get a palindrome (2243443422).

The spelling of 1131222111 in words is "one billion, one hundred thirty-one million, two hundred twenty-two thousand, one hundred eleven".