3257521 has 2 divisors, whose sum is σ = 3257522. Its totient is φ = 3257520.

The previous prime is 3257519. The next prime is 3257533. The reversal of 3257521 is 1257523.

3257521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2217121 + 1040400 = 1489^2 + 1020^2 .

It is a cyclic number.

It is not a de Polignac number, because 3257521 - 2¹ = 3257519 is a prime.

It is a super-2 number, since 2×3257521² = 21222886130882, which contains 22 as substring.

Together with 3257519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3254521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1628760 + 1628761.

It is an arithmetic number, because the mean of its divisors is an integer number (1628761).

Almost surely, 2^3257521 is an apocalyptic number.

It is an amenable number.

3257521 is a deficient number, since it is larger than the sum of its proper divisors (1).

3257521 is an equidigital number, since it uses as much as digits as its factorization.

3257521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2100, while the sum is 25.

The square root of 3257521 is about 1804.8603824119. The cubic root of 3257521 is about 148.2389765887.

The spelling of 3257521 in words is "three million, two hundred fifty-seven thousand, five hundred twenty-one".