13545221 has 4 divisors (see below), whose sum is σ = 13676832. Its totient is φ = 13413612.

The previous prime is 13545199. The next prime is 13545227. The reversal of 13545221 is 12254531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13545221 - 2¹⁰ = 13544197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13545227) 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 in 3 ways as a sum of consecutive naturals, for example, 65651 + ... + 65856.

It is an arithmetic number, because the mean of its divisors is an integer number (3419208).

Almost surely, 2^13545221 is an apocalyptic number.

It is an amenable number.

13545221 is a deficient number, since it is larger than the sum of its proper divisors (131611).

13545221 is a wasteful number, since it uses less digits than its factorization.

13545221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131610.

The product of its digits is 1200, while the sum is 23.

The square root of 13545221 is about 3680.3832680850. The cubic root of 13545221 is about 238.3757276480.

Adding to 13545221 its reverse (12254531), we get a palindrome (25799752).

The spelling of 13545221 in words is "thirteen million, five hundred forty-five thousand, two hundred twenty-one".