7525521 has 16 divisors (see below), whose sum is σ = 11222400. Its totient is φ = 4983984.

The previous prime is 7525519. The next prime is 7525571. The reversal of 7525521 is 1255257.

It is a happy number.

It is not a de Polignac number, because 7525521 - 2¹ = 7525519 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (7525571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3675 + ... + 5343.

It is an arithmetic number, because the mean of its divisors is an integer number (701400).

Almost surely, 2^7525521 is an apocalyptic number.

It is an amenable number.

7525521 is a deficient number, since it is larger than the sum of its proper divisors (3696879).

7525521 is a wasteful number, since it uses less digits than its factorization.

7525521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1845 (or 1839 counting only the distinct ones).

The product of its digits is 3500, while the sum is 27.

The square root of 7525521 is about 2743.2683062362. The cubic root of 7525521 is about 195.9651558912.

The spelling of 7525521 in words is "seven million, five hundred twenty-five thousand, five hundred twenty-one".