1311211133 has 4 divisors (see below), whose sum is σ = 1356425340. Its totient is φ = 1265996928.

The previous prime is 1311211079. The next prime is 1311211157. The reversal of 1311211133 is 3311121131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3311121131 = 43 ⋅77002817.

It can be written as a sum of positive squares in 2 ways, for example, as 559464409 + 751746724 = 23653^2 + 27418^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311211133 - 2¹⁴ = 1311194749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311211333) 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, 22607060 + ... + 22607117.

It is an arithmetic number, because the mean of its divisors is an integer number (339106335).

Almost surely, 2^1311211133 is an apocalyptic number.

It is an amenable number.

1311211133 is a deficient number, since it is larger than the sum of its proper divisors (45214207).

1311211133 is an equidigital number, since it uses as much as digits as its factorization.

1311211133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45214206.

The product of its digits is 54, while the sum is 17.

The square root of 1311211133 is about 36210.6494418424. The cubic root of 1311211133 is about 1094.5212791711.

Adding to 1311211133 its reverse (3311121131), we get a palindrome (4622332264).

The spelling of 1311211133 in words is "one billion, three hundred eleven million, two hundred eleven thousand, one hundred thirty-three".