18548521 has 2 divisors, whose sum is σ = 18548522. Its totient is φ = 18548520.

The previous prime is 18548501. The next prime is 18548527. The reversal of 18548521 is 12584581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14592400 + 3956121 = 3820^2 + 1989^2 .

It is a cyclic number.

It is not a de Polignac number, because 18548521 - 2⁷ = 18548393 is a prime.

It is not a weakly prime, because it can be changed into another prime (18548527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9274260 + 9274261.

It is an arithmetic number, because the mean of its divisors is an integer number (9274261).

Almost surely, 2^18548521 is an apocalyptic number.

It is an amenable number.

18548521 is a deficient number, since it is larger than the sum of its proper divisors (1).

18548521 is an equidigital number, since it uses as much as digits as its factorization.

18548521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12800, while the sum is 34.

The square root of 18548521 is about 4306.7993916597. The cubic root of 18548521 is about 264.7096428156.

The spelling of 18548521 in words is "eighteen million, five hundred forty-eight thousand, five hundred twenty-one".