12185521 has 2 divisors, whose sum is σ = 12185522. Its totient is φ = 12185520.

The previous prime is 12185497. The next prime is 12185527. The reversal of 12185521 is 12558121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10400625 + 1784896 = 3225^2 + 1336^2 .

It is a cyclic number.

It is not a de Polignac number, because 12185521 - 2¹⁵ = 12152753 is a prime.

It is not a weakly prime, because it can be changed into another prime (12185527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6092760 + 6092761.

It is an arithmetic number, because the mean of its divisors is an integer number (6092761).

Almost surely, 2^12185521 is an apocalyptic number.

It is an amenable number.

12185521 is a deficient number, since it is larger than the sum of its proper divisors (1).

12185521 is an equidigital number, since it uses as much as digits as its factorization.

12185521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 800, while the sum is 25.

The square root of 12185521 is about 3490.7765611680. The cubic root of 12185521 is about 230.1166453068.

The spelling of 12185521 in words is "twelve million, one hundred eighty-five thousand, five hundred twenty-one".