3613521 has 4 divisors (see below), whose sum is σ = 4818032. Its totient is φ = 2409012.

The previous prime is 3613517. The next prime is 3613523. The reversal of 3613521 is 1253163.

3613521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1253163 = 3 ⋅417721.

It is not a de Polignac number, because 3613521 - 2² = 3613517 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3613523) 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 in 3 ways as a sum of consecutive naturals, for example, 602251 + ... + 602256.

It is an arithmetic number, because the mean of its divisors is an integer number (1204508).

Almost surely, 2^3613521 is an apocalyptic number.

It is an amenable number.

3613521 is a deficient number, since it is larger than the sum of its proper divisors (1204511).

3613521 is a wasteful number, since it uses less digits than its factorization.

3613521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1204510.

The product of its digits is 540, while the sum is 21.

The square root of 3613521 is about 1900.9263531237. The cubic root of 3613521 is about 153.4535221287.

Adding to 3613521 its reverse (1253163), we get a palindrome (4866684).

The spelling of 3613521 in words is "three million, six hundred thirteen thousand, five hundred twenty-one".