55528521 has 4 divisors (see below), whose sum is σ = 74038032. Its totient is φ = 37019012.

The previous prime is 55528519. The next prime is 55528531. The reversal of 55528521 is 12582555.

55528521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 55528521 - 2¹ = 55528519 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55528531) 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, 9254751 + ... + 9254756.

It is an arithmetic number, because the mean of its divisors is an integer number (18509508).

Almost surely, 2^55528521 is an apocalyptic number.

It is an amenable number.

55528521 is a deficient number, since it is larger than the sum of its proper divisors (18509511).

55528521 is a wasteful number, since it uses less digits than its factorization.

55528521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18509510.

The product of its digits is 20000, while the sum is 33.

The square root of 55528521 is about 7451.7461712004. The cubic root of 55528521 is about 381.5095104605.

The spelling of 55528521 in words is "fifty-five million, five hundred twenty-eight thousand, five hundred twenty-one".