55525321 has 4 divisors (see below), whose sum is σ = 55559812. Its totient is φ = 55490832.

The previous prime is 55525303. The next prime is 55525331. The reversal of 55525321 is 12352555.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43414921 + 12110400 = 6589^2 + 3480^2 .

It is a cyclic number.

It is not a de Polignac number, because 55525321 - 2¹⁷ = 55394249 is a prime.

It is a super-2 number, since 2×55525321² = 6166122544306082, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55525321.

It is not an unprimeable number, because it can be changed into a prime (55525331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14706 + ... + 18091.

It is an arithmetic number, because the mean of its divisors is an integer number (13889953).

Almost surely, 2^55525321 is an apocalyptic number.

It is an amenable number.

55525321 is a deficient number, since it is larger than the sum of its proper divisors (34491).

55525321 is a wasteful number, since it uses less digits than its factorization.

55525321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34490.

The product of its digits is 7500, while the sum is 28.

The square root of 55525321 is about 7451.5314533323. The cubic root of 55525321 is about 381.5021817709.

Adding to 55525321 its reverse (12352555), we get a palindrome (67877876).

The spelling of 55525321 in words is "fifty-five million, five hundred twenty-five thousand, three hundred twenty-one".