55525521 has 16 divisors (see below), whose sum is σ = 76265280. Its totient is φ = 35911680.

The previous prime is 55525511. The next prime is 55525523. The reversal of 55525521 is 12552555.

55525521 = 189² + 190² + ... + 557².

It is not a de Polignac number, because 55525521 - 2⁵ = 55525489 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55525523) 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 in 15 ways as a sum of consecutive naturals, for example, 22570 + ... + 24908.

It is an arithmetic number, because the mean of its divisors is an integer number (4766580).

Almost surely, 2^55525521 is an apocalyptic number.

It is an amenable number.

55525521 is a deficient number, since it is larger than the sum of its proper divisors (20739759).

55525521 is a wasteful number, since it uses less digits than its factorization.

55525521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2576.

The product of its digits is 12500, while the sum is 30.

The square root of 55525521 is about 7451.5448733803. The cubic root of 55525521 is about 381.5026398223.

The spelling of 55525521 in words is "fifty-five million, five hundred twenty-five thousand, five hundred twenty-one".