7229521 has 8 divisors (see below), whose sum is σ = 8124480. Its totient is φ = 6382992.

The previous prime is 7229513. The next prime is 7229531. The reversal of 7229521 is 1259227.

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 7229521 - 2³ = 7229513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7229521.

It is not an unprimeable number, because it can be changed into a prime (7229531) 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, 11791 + ... + 12388.

It is an arithmetic number, because the mean of its divisors is an integer number (1015560).

Almost surely, 2^7229521 is an apocalyptic number.

It is an amenable number.

7229521 is a deficient number, since it is larger than the sum of its proper divisors (894959).

7229521 is a wasteful number, since it uses less digits than its factorization.

7229521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24215.

The product of its digits is 2520, while the sum is 28.

The square root of 7229521 is about 2688.7768594660. The cubic root of 7229521 is about 193.3614264236.

It can be divided in two parts, 7229 and 521, that added together give a triangular number (7750 = T₁₂₄).

The spelling of 7229521 in words is "seven million, two hundred twenty-nine thousand, five hundred twenty-one".