3500521 has 4 divisors (see below), whose sum is σ = 3706452. Its totient is φ = 3294592.

The previous prime is 3500509. The next prime is 3500537. The reversal of 3500521 is 1250053.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2143296 + 1357225 = 1464^2 + 1165^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3500521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3500495 and 3500504.

It is not an unprimeable number, because it can be changed into a prime (3509521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102940 + ... + 102973.

It is an arithmetic number, because the mean of its divisors is an integer number (926613).

Almost surely, 2^3500521 is an apocalyptic number.

It is an amenable number.

3500521 is a deficient number, since it is larger than the sum of its proper divisors (205931).

3500521 is a wasteful number, since it uses less digits than its factorization.

3500521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205930.

The product of its (nonzero) digits is 150, while the sum is 16.

The square root of 3500521 is about 1870.9679313126. The cubic root of 3500521 is about 151.8369818526.

Adding to 3500521 its reverse (1250053), we get a palindrome (4750574).

It can be divided in two parts, 350052 and 1, that added together give a palindrome (350053).

The spelling of 3500521 in words is "three million, five hundred thousand, five hundred twenty-one".