3318521 has 4 divisors (see below), whose sum is σ = 3493200. Its totient is φ = 3143844.

The previous prime is 3318503. The next prime is 3318533. The reversal of 3318521 is 1258133.

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 3318521 - 2¹⁴ = 3302137 is a prime.

It is a super-2 number, since 2×3318521² = 22025163254882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3318571) 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, 87311 + ... + 87348.

It is an arithmetic number, because the mean of its divisors is an integer number (873300).

Almost surely, 2^3318521 is an apocalyptic number.

It is an amenable number.

3318521 is a deficient number, since it is larger than the sum of its proper divisors (174679).

3318521 is a wasteful number, since it uses less digits than its factorization.

3318521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174678.

The product of its digits is 720, while the sum is 23.

The square root of 3318521 is about 1821.6808172674. The cubic root of 3318521 is about 149.1585627895.

The spelling of 3318521 in words is "three million, three hundred eighteen thousand, five hundred twenty-one".