1143312311 has 4 divisors (see below), whose sum is σ = 1146041400. Its totient is φ = 1140583224.

The previous prime is 1143312299. The next prime is 1143312319. The reversal of 1143312311 is 1132133411.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1143312311 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 (1143312319) 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, 1363916 + ... + 1364753.

It is an arithmetic number, because the mean of its divisors is an integer number (286510350).

Almost surely, 2^1143312311 is an apocalyptic number.

1143312311 is a deficient number, since it is larger than the sum of its proper divisors (2729089).

1143312311 is an equidigital number, since it uses as much as digits as its factorization.

1143312311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2729088.

The product of its digits is 216, while the sum is 20.

The square root of 1143312311 is about 33812.9015465990. The cubic root of 1143312311 is about 1045.6546986755.

Adding to 1143312311 its reverse (1132133411), we get a palindrome (2275445722).

The spelling of 1143312311 in words is "one billion, one hundred forty-three million, three hundred twelve thousand, three hundred eleven".