1311122233 has 4 divisors (see below), whose sum is σ = 1313427060. Its totient is φ = 1308817408.

The previous prime is 1311122221. The next prime is 1311122237. The reversal of 1311122233 is 3322211131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 368140969 + 942981264 = 19187^2 + 30708^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311122233 - 2⁵ = 1311122201 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1311122233.

It is not an unprimeable number, because it can be changed into a prime (1311122237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1151560 + ... + 1152697.

It is an arithmetic number, because the mean of its divisors is an integer number (328356765).

Almost surely, 2^1311122233 is an apocalyptic number.

It is an amenable number.

1311122233 is a deficient number, since it is larger than the sum of its proper divisors (2304827).

1311122233 is an equidigital number, since it uses as much as digits as its factorization.

1311122233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2304826.

The product of its digits is 216, while the sum is 19.

The square root of 1311122233 is about 36209.4218816042. The cubic root of 1311122233 is about 1094.4965424631.

Adding to 1311122233 its reverse (3322211131), we get a palindrome (4633333364).

It can be divided in two parts, 13111 and 22233, that added together give a square (35344 = 188²).

The spelling of 1311122233 in words is "one billion, three hundred eleven million, one hundred twenty-two thousand, two hundred thirty-three".