1312211143 has 2 divisors, whose sum is σ = 1312211144. Its totient is φ = 1312211142.

The previous prime is 1312211141. The next prime is 1312211161. The reversal of 1312211143 is 3411122131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1312211143 - 2¹ = 1312211141 is a prime.

Together with 1312211141, 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 1312211143.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1312211141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656105571 + 656105572.

It is an arithmetic number, because the mean of its divisors is an integer number (656105572).

Almost surely, 2^1312211143 is an apocalyptic number.

1312211143 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312211143 is an equidigital number, since it uses as much as digits as its factorization.

1312211143 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1312211143 is about 36224.4550407594. The cubic root of 1312211143 is about 1094.7994581417.

Adding to 1312211143 its reverse (3411122131), we get a palindrome (4723333274).

The spelling of 1312211143 in words is "one billion, three hundred twelve million, two hundred eleven thousand, one hundred forty-three".