3851701621 has 2 divisors, whose sum is σ = 3851701622. Its totient is φ = 3851701620.

The previous prime is 3851701619. The next prime is 3851701631. The reversal of 3851701621 is 1261071583.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2665656900 + 1186044721 = 51630^2 + 34439^2 .

It is a cyclic number.

It is not a de Polignac number, because 3851701621 - 2¹ = 3851701619 is a prime.

Together with 3851701619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3851701631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1925850810 + 1925850811.

It is an arithmetic number, because the mean of its divisors is an integer number (1925850811).

Almost surely, 2^3851701621 is an apocalyptic number.

It is an amenable number.

3851701621 is a deficient number, since it is larger than the sum of its proper divisors (1).

3851701621 is an equidigital number, since it uses as much as digits as its factorization.

3851701621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 3851701621 is about 62062.0787679562. The cubic root of 3851701621 is about 1567.5360788109.

The spelling of 3851701621 in words is "three billion, eight hundred fifty-one million, seven hundred one thousand, six hundred twenty-one".