1311322993 has 2 divisors, whose sum is σ = 1311322994. Its totient is φ = 1311322992.

The previous prime is 1311322949. The next prime is 1311323003. The reversal of 1311322993 is 3992231131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1276418529 + 34904464 = 35727^2 + 5908^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311322993 is a prime.

It is not a weakly prime, because it can be changed into another prime (1311322913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655661496 + 655661497.

It is an arithmetic number, because the mean of its divisors is an integer number (655661497).

Almost surely, 2^1311322993 is an apocalyptic number.

It is an amenable number.

1311322993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311322993 is an equidigital number, since it uses as much as digits as its factorization.

1311322993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8748, while the sum is 34.

The square root of 1311322993 is about 36212.1939821381. The cubic root of 1311322993 is about 1094.5524029837.

The spelling of 1311322993 in words is "one billion, three hundred eleven million, three hundred twenty-two thousand, nine hundred ninety-three".