3631521 has 8 divisors (see below), whose sum is σ = 4865824. Its totient is φ = 2409120.

The previous prime is 3631519. The next prime is 3631541. The reversal of 3631521 is 1251363.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3631521 - 2¹ = 3631519 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3631501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2236 + ... + 3501.

It is an arithmetic number, because the mean of its divisors is an integer number (608228).

Almost surely, 2^3631521 is an apocalyptic number.

It is an amenable number.

3631521 is a deficient number, since it is larger than the sum of its proper divisors (1234303).

3631521 is a wasteful number, since it uses less digits than its factorization.

3631521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5951.

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

The square root of 3631521 is about 1905.6550055034. The cubic root of 3631521 is about 153.7078991079.

Adding to 3631521 its reverse (1251363), we get a palindrome (4882884).

The spelling of 3631521 in words is "three million, six hundred thirty-one thousand, five hundred twenty-one".