7525321 has 4 divisors (see below), whose sum is σ = 7579600. Its totient is φ = 7471044.

The previous prime is 7525313. The next prime is 7525333. The reversal of 7525321 is 1235257.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1235257 = 31 ⋅39847.

It is a cyclic number.

It is not a de Polignac number, because 7525321 - 2³ = 7525313 is a prime.

It is a d-powerful number, because it can be written as 7⁸ + 5³ + 2¹⁸ + 5⁸ + 3¹⁰ + 2²⁰ + 1 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7525381) 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, 26931 + ... + 27208.

It is an arithmetic number, because the mean of its divisors is an integer number (1894900).

Almost surely, 2^7525321 is an apocalyptic number.

It is an amenable number.

7525321 is a deficient number, since it is larger than the sum of its proper divisors (54279).

7525321 is a wasteful number, since it uses less digits than its factorization.

7525321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54278.

The product of its digits is 2100, while the sum is 25.

The square root of 7525321 is about 2743.2318531251. The cubic root of 7525321 is about 195.9634198706.

Subtracting from 7525321 its reverse (1235257), we obtain a square (6290064 = 2508²).

The spelling of 7525321 in words is "seven million, five hundred twenty-five thousand, three hundred twenty-one".