3813521 has 2 divisors, whose sum is σ = 3813522. Its totient is φ = 3813520.

The previous prime is 3813517. The next prime is 3813539. The reversal of 3813521 is 1253183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2890000 + 923521 = 1700^2 + 961^2 .

It is a cyclic number.

It is not a de Polignac number, because 3813521 - 2² = 3813517 is a prime.

It is not a weakly prime, because it can be changed into another prime (3813571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1906760 + 1906761.

It is an arithmetic number, because the mean of its divisors is an integer number (1906761).

Almost surely, 2^3813521 is an apocalyptic number.

It is an amenable number.

3813521 is a deficient number, since it is larger than the sum of its proper divisors (1).

3813521 is an equidigital number, since it uses as much as digits as its factorization.

3813521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 23.

The square root of 3813521 is about 1952.8238527835. The cubic root of 3813521 is about 156.2339384024.

It can be divided in two parts, 3813 and 521, that added together give a palindrome (4334).

The spelling of 3813521 in words is "three million, eight hundred thirteen thousand, five hundred twenty-one".