7525221 has 16 divisors (see below), whose sum is σ = 11020800. Its totient is φ = 4529520.

The previous prime is 7525213. The next prime is 7525247. The reversal of 7525221 is 1225257.

It is not a de Polignac number, because 7525221 - 2³ = 7525213 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 7525191 and 7525200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7525261) 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 15 ways as a sum of consecutive naturals, for example, 4680 + ... + 6078.

It is an arithmetic number, because the mean of its divisors is an integer number (688800).

Almost surely, 2^7525221 is an apocalyptic number.

It is an amenable number.

7525221 is a deficient number, since it is larger than the sum of its proper divisors (3495579).

7525221 is a wasteful number, since it uses less digits than its factorization.

7525221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1576.

The product of its digits is 1400, while the sum is 24.

The square root of 7525221 is about 2743.2136263879. The cubic root of 7525221 is about 195.9625518487.

The spelling of 7525221 in words is "seven million, five hundred twenty-five thousand, two hundred twenty-one".