1313768749 has 2 divisors, whose sum is σ = 1313768750. Its totient is φ = 1313768748.

The previous prime is 1313768713. The next prime is 1313768801. The reversal of 1313768749 is 9478673131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 677821225 + 635947524 = 26035^2 + 25218^2 .

It is an emirp because it is prime and its reverse (9478673131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1313768749 - 2¹³ = 1313760557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1313768549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656884374 + 656884375.

It is an arithmetic number, because the mean of its divisors is an integer number (656884375).

Almost surely, 2^1313768749 is an apocalyptic number.

It is an amenable number.

1313768749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1313768749 is an equidigital number, since it uses as much as digits as its factorization.

1313768749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 49.

The square root of 1313768749 is about 36245.9480356081. The cubic root of 1313768749 is about 1095.2324656742.

The spelling of 1313768749 in words is "one billion, three hundred thirteen million, seven hundred sixty-eight thousand, seven hundred forty-nine".