1311122143 has 2 divisors, whose sum is σ = 1311122144. Its totient is φ = 1311122142.

The previous prime is 1311122117. The next prime is 1311122167. The reversal of 1311122143 is 3412211131.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311122143 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1311122143.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311122173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655561071 + 655561072.

It is an arithmetic number, because the mean of its divisors is an integer number (655561072).

Almost surely, 2^1311122143 is an apocalyptic number.

1311122143 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311122143 is an equidigital number, since it uses as much as digits as its factorization.

1311122143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144, while the sum is 19.

The square root of 1311122143 is about 36209.4206388338. The cubic root of 1311122143 is about 1094.4965174197.

Adding to 1311122143 its reverse (3412211131), we get a palindrome (4723333274).

The spelling of 1311122143 in words is "one billion, three hundred eleven million, one hundred twenty-two thousand, one hundred forty-three".