4021525 has 6 divisors (see below), whose sum is σ = 4986722. Its totient is φ = 3217200.

The previous prime is 4021519. The next prime is 4021529. The reversal of 4021525 is 5251204.

It can be written as a sum of positive squares in 3 ways, for example, as 777924 + 3243601 = 882^2 + 1801^2 .

It is not a de Polignac number, because 4021525 - 2⁷ = 4021397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021529) 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 5 ways as a sum of consecutive naturals, for example, 80406 + ... + 80455.

Almost surely, 2^4021525 is an apocalyptic number.

It is an amenable number.

4021525 is a deficient number, since it is larger than the sum of its proper divisors (965197).

4021525 is a wasteful number, since it uses less digits than its factorization.

4021525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160871 (or 160866 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 4021525 is about 2005.3740299505. The cubic root of 4021525 is about 159.0243360295.

Adding to 4021525 its reverse (5251204), we get a palindrome (9272729).

The spelling of 4021525 in words is "four million, twenty-one thousand, five hundred twenty-five".