1338812861 has 2 divisors, whose sum is σ = 1338812862. Its totient is φ = 1338812860.

The previous prime is 1338812857. The next prime is 1338812887. The reversal of 1338812861 is 1682188331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1319505625 + 19307236 = 36325^2 + 4394^2 .

It is an emirp because it is prime and its reverse (1682188331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1338812861 - 2² = 1338812857 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1338812821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669406430 + 669406431.

It is an arithmetic number, because the mean of its divisors is an integer number (669406431).

Almost surely, 2^1338812861 is an apocalyptic number.

It is an amenable number.

1338812861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1338812861 is an equidigital number, since it uses as much as digits as its factorization.

1338812861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 41.

The square root of 1338812861 is about 36589.7917594512. The cubic root of 1338812861 is about 1102.1481057042.

The spelling of 1338812861 in words is "one billion, three hundred thirty-eight million, eight hundred twelve thousand, eight hundred sixty-one".