1311231133 has 4 divisors (see below), whose sum is σ = 1312292380. Its totient is φ = 1310169888.

The previous prime is 1311231083. The next prime is 1311231167. The reversal of 1311231133 is 3311321131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3311321131 = 2789 ⋅1187279.

It can be written as a sum of positive squares in 2 ways, for example, as 721567044 + 589664089 = 26862^2 + 24283^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311231133 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 1311231133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311231193) 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 3 ways as a sum of consecutive naturals, for example, 528768 + ... + 531241.

It is an arithmetic number, because the mean of its divisors is an integer number (328073095).

Almost surely, 2^1311231133 is an apocalyptic number.

It is an amenable number.

1311231133 is a deficient number, since it is larger than the sum of its proper divisors (1061247).

1311231133 is a wasteful number, since it uses less digits than its factorization.

1311231133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1061246.

The product of its digits is 162, while the sum is 19.

The square root of 1311231133 is about 36210.9256026410. The cubic root of 1311231133 is about 1094.5268440807.

Adding to 1311231133 its reverse (3311321131), we get a palindrome (4622552264).

The spelling of 1311231133 in words is "one billion, three hundred eleven million, two hundred thirty-one thousand, one hundred thirty-three".