3520521 has 12 divisors (see below), whose sum is σ = 5102448. Its totient is φ = 2339064.

The previous prime is 3520519. The next prime is 3520537. The reversal of 3520521 is 1250253.

It is a happy number.

It is not a de Polignac number, because 3520521 - 2¹ = 3520519 is a prime.

It is a super-2 number, since 2×3520521² = 24788136222882, which contains 22 as substring.

It is a nialpdrome in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 3520494 and 3520503.

It is not an unprimeable number, because it can be changed into a prime (3520511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3546 + ... + 4428.

It is an arithmetic number, because the mean of its divisors is an integer number (425204).

Almost surely, 2^3520521 is an apocalyptic number.

It is an amenable number.

3520521 is a deficient number, since it is larger than the sum of its proper divisors (1581927).

3520521 is a wasteful number, since it uses less digits than its factorization.

3520521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332 (or 1329 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 3520521 is about 1876.3051457585. The cubic root of 3520521 is about 152.1256031293.

Adding to 3520521 its reverse (1250253), we get a palindrome (4770774).

The spelling of 3520521 in words is "three million, five hundred twenty thousand, five hundred twenty-one".