7535221 has 4 divisors (see below), whose sum is σ = 7541100. Its totient is φ = 7529344.

The previous prime is 7535197. The next prime is 7535239. The reversal of 7535221 is 1225357.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3591025 + 3944196 = 1895^2 + 1986^2 .

It is a cyclic number.

It is not a de Polignac number, because 7535221 - 2⁷ = 7535093 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 (7535921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106 + ... + 3883.

It is an arithmetic number, because the mean of its divisors is an integer number (1885275).

Almost surely, 2^7535221 is an apocalyptic number.

It is an amenable number.

7535221 is a deficient number, since it is larger than the sum of its proper divisors (5879).

7535221 is a wasteful number, since it uses less digits than its factorization.

7535221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5878.

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

The square root of 7535221 is about 2745.0357010429. The cubic root of 7535221 is about 196.0493159953.

The spelling of 7535221 in words is "seven million, five hundred thirty-five thousand, two hundred twenty-one".