1311143 has 2 divisors, whose sum is σ = 1311144. Its totient is φ = 1311142.

The previous prime is 1311131. The next prime is 1311173. The reversal of 1311143 is 3411131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1311143 - 2⁴ = 1311127 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655571 + 655572.

It is an arithmetic number, because the mean of its divisors is an integer number (655572).

2^1311143 is an apocalyptic number.

1311143 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311143 is an equidigital number, since it uses as much as digits as its factorization.

1311143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36, while the sum is 14.

The square root of 1311143 is about 1145.0515272249. The cubic root of 1311143 is about 109.4502321047.

Adding to 1311143 its reverse (3411131), we get a palindrome (4722274).

The spelling of 1311143 in words is "one million, three hundred eleven thousand, one hundred forty-three".