16560521 has 2 divisors, whose sum is σ = 16560522. Its totient is φ = 16560520.

The previous prime is 16560493. The next prime is 16560527. The reversal of 16560521 is 12506561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10310521 + 6250000 = 3211^2 + 2500^2 .

It is an emirp because it is prime and its reverse (12506561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16560521 - 2¹⁰ = 16559497 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16560527) 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, 8280260 + 8280261.

It is an arithmetic number, because the mean of its divisors is an integer number (8280261).

Almost surely, 2^16560521 is an apocalyptic number.

It is an amenable number.

16560521 is a deficient number, since it is larger than the sum of its proper divisors (1).

16560521 is an equidigital number, since it uses as much as digits as its factorization.

16560521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 16560521 is about 4069.4620037543. The cubic root of 16560521 is about 254.8930526790.

The spelling of 16560521 in words is "sixteen million, five hundred sixty thousand, five hundred twenty-one".