1143305311 has 4 divisors (see below), whose sum is σ = 1143711712. Its totient is φ = 1142898912.

The previous prime is 1143305299. The next prime is 1143305323. The reversal of 1143305311 is 1135033411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1135033411 = 31 ⋅36613981.

It is an interprime number because it is at equal distance from previous prime (1143305299) and next prime (1143305323).

It is a cyclic number.

It is not a de Polignac number, because 1143305311 - 2⁵ = 1143305279 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 (1143305351) 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, 198951 + ... + 204616.

It is an arithmetic number, because the mean of its divisors is an integer number (285927928).

Almost surely, 2^1143305311 is an apocalyptic number.

1143305311 is a deficient number, since it is larger than the sum of its proper divisors (406401).

1143305311 is an equidigital number, since it uses as much as digits as its factorization.

1143305311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406400.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 1143305311 is about 33812.7980356551. The cubic root of 1143305311 is about 1045.6525646427.

Adding to 1143305311 its reverse (1135033411), we get a palindrome (2278338722).

The spelling of 1143305311 in words is "one billion, one hundred forty-three million, three hundred five thousand, three hundred eleven".