3639521 has 2 divisors, whose sum is σ = 3639522. Its totient is φ = 3639520.

The previous prime is 3639509. The next prime is 3639523. The reversal of 3639521 is 1259363.

3639521 is digitally balanced in base 2, 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., 2560000 + 1079521 = 1600^2 + 1039^2 .

It is a cyclic number.

It is not a de Polignac number, because 3639521 - 2¹⁰ = 3638497 is a prime.

It is a super-2 number, since 2×3639521² = 26492226218882, which contains 22 as substring.

Together with 3639523, it forms a pair of twin primes.

It is a Chen prime.

It is a d-powerful number, because it can be written as 3⁴ + 6⁸ + 3⁸ + 9 + 5⁹ + 2⁷ + 1 .

It is not a weakly prime, because it can be changed into another prime (3639523) 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, 1819760 + 1819761.

It is an arithmetic number, because the mean of its divisors is an integer number (1819761).

Almost surely, 2^3639521 is an apocalyptic number.

It is an amenable number.

3639521 is a deficient number, since it is larger than the sum of its proper divisors (1).

3639521 is an equidigital number, since it uses as much as digits as its factorization.

3639521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4860, while the sum is 29.

The square root of 3639521 is about 1907.7528665946. The cubic root of 3639521 is about 153.8206857650.

The spelling of 3639521 in words is "three million, six hundred thirty-nine thousand, five hundred twenty-one".