3828621521 has 2 divisors, whose sum is σ = 3828621522. Its totient is φ = 3828621520.

The previous prime is 3828621479. The next prime is 3828621523. The reversal of 3828621521 is 1251268283.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3538941121 + 289680400 = 59489^2 + 17020^2 .

It is a cyclic number.

It is not a de Polignac number, because 3828621521 - 2¹⁸ = 3828359377 is a prime.

Together with 3828621523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3828621523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1914310760 + 1914310761.

It is an arithmetic number, because the mean of its divisors is an integer number (1914310761).

Almost surely, 2^3828621521 is an apocalyptic number.

It is an amenable number.

3828621521 is a deficient number, since it is larger than the sum of its proper divisors (1).

3828621521 is an equidigital number, since it uses as much as digits as its factorization.

3828621521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46080, while the sum is 38.

The square root of 3828621521 is about 61875.8557193353. The cubic root of 3828621521 is about 1564.3988165431.

The spelling of 3828621521 in words is "three billion, eight hundred twenty-eight million, six hundred twenty-one thousand, five hundred twenty-one".