1311103133 has 4 divisors (see below), whose sum is σ = 1333325280. Its totient is φ = 1288880988.

The previous prime is 1311103127. The next prime is 1311103159. The reversal of 1311103133 is 3313011131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3313011131 = 137 ⋅24182563.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311103133 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311103333) 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, 11110985 + ... + 11111102.

It is an arithmetic number, because the mean of its divisors is an integer number (333331320).

Almost surely, 2^1311103133 is an apocalyptic number.

It is an amenable number.

1311103133 is a deficient number, since it is larger than the sum of its proper divisors (22222147).

1311103133 is an equidigital number, since it uses as much as digits as its factorization.

1311103133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22222146.

The product of its (nonzero) digits is 81, while the sum is 17.

The square root of 1311103133 is about 36209.1581371343. The cubic root of 1311103133 is about 1094.4912276813.

Adding to 1311103133 its reverse (3313011131), we get a palindrome (4624114264).

The spelling of 1311103133 in words is "one billion, three hundred eleven million, one hundred three thousand, one hundred thirty-three".