1311031213 has 2 divisors, whose sum is σ = 1311031214. Its totient is φ = 1311031212.

The previous prime is 1311031201. The next prime is 1311031219. The reversal of 1311031213 is 3121301131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1268285769 + 42745444 = 35613^2 + 6538^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311031213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311031219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655515606 + 655515607.

It is an arithmetic number, because the mean of its divisors is an integer number (655515607).

Almost surely, 2^1311031213 is an apocalyptic number.

It is an amenable number.

1311031213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311031213 is an equidigital number, since it uses as much as digits as its factorization.

1311031213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 1311031213 is about 36208.1650045953. The cubic root of 1311031213 is about 1094.4712146998.

Adding to 1311031213 its reverse (3121301131), we get a palindrome (4432332344).

The spelling of 1311031213 in words is "one billion, three hundred eleven million, thirty-one thousand, two hundred thirteen".