3863801621 has 2 divisors, whose sum is σ = 3863801622. Its totient is φ = 3863801620.

The previous prime is 3863801609. The next prime is 3863801629. The reversal of 3863801621 is 1261083683.

3863801621 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2979631396 + 884170225 = 54586^2 + 29735^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3863801621 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 (3863801629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1931900810 + 1931900811.

It is an arithmetic number, because the mean of its divisors is an integer number (1931900811).

Almost surely, 2^3863801621 is an apocalyptic number.

It is an amenable number.

3863801621 is a deficient number, since it is larger than the sum of its proper divisors (1).

3863801621 is an equidigital number, since it uses as much as digits as its factorization.

3863801621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 3863801621 is about 62159.4853662737. The cubic root of 3863801621 is about 1569.1758181090.

The spelling of 3863801621 in words is "three billion, eight hundred sixty-three million, eight hundred one thousand, six hundred twenty-one".