1311213133 has 2 divisors, whose sum is σ = 1311213134. Its totient is φ = 1311213132.

The previous prime is 1311213131. The next prime is 1311213149. The reversal of 1311213133 is 3313121131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 920636964 + 390576169 = 30342^2 + 19763^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311213133 - 2¹ = 1311213131 is a prime.

Together with 1311213131, 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 1311213133.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311213131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655606566 + 655606567.

It is an arithmetic number, because the mean of its divisors is an integer number (655606567).

Almost surely, 2^1311213133 is an apocalyptic number.

It is an amenable number.

1311213133 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311213133 is an equidigital number, since it uses as much as digits as its factorization.

1311213133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 162, while the sum is 19.

The square root of 1311213133 is about 36210.6770580170. The cubic root of 1311213133 is about 1094.5218356646.

Adding to 1311213133 its reverse (3313121131), we get a palindrome (4624334264).

The spelling of 1311213133 in words is "one billion, three hundred eleven million, two hundred thirteen thousand, one hundred thirty-three".