55424521 has 4 divisors (see below), whose sum is σ = 55444500. Its totient is φ = 55404544.

The previous prime is 55424513. The next prime is 55424527. The reversal of 55424521 is 12542455.

55424521 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.

It can be written as a sum of positive squares in 2 ways, for example, as 32490000 + 22934521 = 5700^2 + 4789^2 .

It is a cyclic number.

It is not a de Polignac number, because 55424521 - 2³ = 55424513 is a prime.

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 55424521.

It is not an unprimeable number, because it can be changed into a prime (55424527) 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, 4996 + ... + 11653.

It is an arithmetic number, because the mean of its divisors is an integer number (13861125).

Almost surely, 2^55424521 is an apocalyptic number.

It is an amenable number.

55424521 is a deficient number, since it is larger than the sum of its proper divisors (19979).

55424521 is a wasteful number, since it uses less digits than its factorization.

55424521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19978.

The product of its digits is 8000, while the sum is 28.

The square root of 55424521 is about 7444.7646705588. The cubic root of 55424521 is about 381.2711837732.

Adding to 55424521 its reverse (12542455), we get a palindrome (67966976).

It can be divided in two parts, 55424 and 521, that added together give a triangular number (55945 = T₃₃₄).

The spelling of 55424521 in words is "fifty-five million, four hundred twenty-four thousand, five hundred twenty-one".