7208521 has 2 divisors, whose sum is σ = 7208522. Its totient is φ = 7208520.

The previous prime is 7208519. The next prime is 7208533. The reversal of 7208521 is 1258027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4840000 + 2368521 = 2200^2 + 1539^2 .

It is an emirp because it is prime and its reverse (1258027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7208521 - 2¹ = 7208519 is a prime.

Together with 7208519, it forms a pair of twin primes.

It is a zygodrome in base 8.

It is not a weakly prime, because it can be changed into another prime (7200521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3604260 + 3604261.

It is an arithmetic number, because the mean of its divisors is an integer number (3604261).

Almost surely, 2^7208521 is an apocalyptic number.

It is an amenable number.

7208521 is a deficient number, since it is larger than the sum of its proper divisors (1).

7208521 is an equidigital number, since it uses as much as digits as its factorization.

7208521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 7208521 is about 2684.8688981028. The cubic root of 7208521 is about 193.1740222149.

The spelling of 7208521 in words is "seven million, two hundred eight thousand, five hundred twenty-one".