7565221 has 8 divisors (see below), whose sum is σ = 8087040. Its totient is φ = 7051968.

The previous prime is 7565191. The next prime is 7565303. The reversal of 7565221 is 1225657.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7565221 - 2⁵ = 7565189 is a prime.

It is an Ulam number.

It is a Duffinian number.

7565221 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 7565221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7565821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 261 + ... + 3898.

It is an arithmetic number, because the mean of its divisors is an integer number (1010880).

Almost surely, 2^7565221 is an apocalyptic number.

It is an amenable number.

7565221 is a deficient number, since it is larger than the sum of its proper divisors (521819).

7565221 is a wasteful number, since it uses less digits than its factorization.

7565221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4283.

The product of its digits is 4200, while the sum is 28.

The square root of 7565221 is about 2750.4946827798. The cubic root of 7565221 is about 196.3091487363.

The spelling of 7565221 in words is "seven million, five hundred sixty-five thousand, two hundred twenty-one".