1311023143 has 2 divisors, whose sum is σ = 1311023144. Its totient is φ = 1311023142.

The previous prime is 1311023141. The next prime is 1311023149. The reversal of 1311023143 is 3413201131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1311023143 - 2¹ = 1311023141 is a prime.

Together with 1311023141, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1311023143.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311023141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655511571 + 655511572.

It is an arithmetic number, because the mean of its divisors is an integer number (655511572).

Almost surely, 2^1311023143 is an apocalyptic number.

1311023143 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311023143 is an equidigital number, since it uses as much as digits as its factorization.

1311023143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1311023143 is about 36208.0535654708. The cubic root of 1311023143 is about 1094.4689690373.

Adding to 1311023143 its reverse (3413201131), we get a palindrome (4724224274).

The spelling of 1311023143 in words is "one billion, three hundred eleven million, twenty-three thousand, one hundred forty-three".