1968748813 has 2 divisors, whose sum is σ = 1968748814. Its totient is φ = 1968748812.

The previous prime is 1968748807. The next prime is 1968748829. The reversal of 1968748813 is 3188478691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1513054404 + 455694409 = 38898^2 + 21347^2 .

It is an emirp because it is prime and its reverse (3188478691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1968748813 - 2¹³ = 1968740621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1968748843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 984374406 + 984374407.

It is an arithmetic number, because the mean of its divisors is an integer number (984374407).

Almost surely, 2^1968748813 is an apocalyptic number.

It is an amenable number.

1968748813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1968748813 is an equidigital number, since it uses as much as digits as its factorization.

1968748813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2322432, while the sum is 55.

The square root of 1968748813 is about 44370.5849972704. The cubic root of 1968748813 is about 1253.3242318560.

The spelling of 1968748813 in words is "one billion, nine hundred sixty-eight million, seven hundred forty-eight thousand, eight hundred thirteen".