7224521 has 2 divisors, whose sum is σ = 7224522. Its totient is φ = 7224520.

The previous prime is 7224517. The next prime is 7224551. The reversal of 7224521 is 1254227.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3857296 + 3367225 = 1964^2 + 1835^2 .

It is a cyclic number.

It is not a de Polignac number, because 7224521 - 2² = 7224517 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7224551) 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 as a sum of consecutive naturals, namely, 3612260 + 3612261.

It is an arithmetic number, because the mean of its divisors is an integer number (3612261).

Almost surely, 2^7224521 is an apocalyptic number.

It is an amenable number.

7224521 is a deficient number, since it is larger than the sum of its proper divisors (1).

7224521 is an equidigital number, since it uses as much as digits as its factorization.

7224521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1120, while the sum is 23.

The square root of 7224521 is about 2687.8469078428. The cubic root of 7224521 is about 193.3168393248.

Adding to 7224521 its reverse (1254227), we get a palindrome (8478748).

The spelling of 7224521 in words is "seven million, two hundred twenty-four thousand, five hundred twenty-one".