3605521 has 4 divisors (see below), whose sum is σ = 3631600. Its totient is φ = 3579444.

The previous prime is 3605489. The next prime is 3605531. The reversal of 3605521 is 1255063.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3605521 - 2⁵ = 3605489 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3605492 and 3605501.

It is not an unprimeable number, because it can be changed into a prime (3605531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12831 + ... + 13108.

It is an arithmetic number, because the mean of its divisors is an integer number (907900).

Almost surely, 2^3605521 is an apocalyptic number.

It is an amenable number.

3605521 is a deficient number, since it is larger than the sum of its proper divisors (26079).

3605521 is a wasteful number, since it uses less digits than its factorization.

3605521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26078.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 3605521 is about 1898.8209499582. The cubic root of 3605521 is about 153.3401945050.

The spelling of 3605521 in words is "three million, six hundred five thousand, five hundred twenty-one".