1383668821 has 2 divisors, whose sum is σ = 1383668822. Its totient is φ = 1383668820.

The previous prime is 1383668809. The next prime is 1383668857. The reversal of 1383668821 is 1288663831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1179579025 + 204089796 = 34345^2 + 14286^2 .

It is a cyclic number.

It is not a de Polignac number, because 1383668821 - 2²¹ = 1381571669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1383663821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 691834410 + 691834411.

It is an arithmetic number, because the mean of its divisors is an integer number (691834411).

Almost surely, 2^1383668821 is an apocalyptic number.

It is an amenable number.

1383668821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1383668821 is an equidigital number, since it uses as much as digits as its factorization.

1383668821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 331776, while the sum is 46.

The square root of 1383668821 is about 37197.6991358337. The cubic root of 1383668821 is about 1114.3220344467.

The spelling of 1383668821 in words is "one billion, three hundred eighty-three million, six hundred sixty-eight thousand, eight hundred twenty-one".