55040521 has 4 divisors (see below), whose sum is σ = 56938500. Its totient is φ = 53142544.

The previous prime is 55040507. The next prime is 55040527. The reversal of 55040521 is 12504055.

55040521 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 15840400 + 39200121 = 3980^2 + 6261^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55040521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55040492 and 55040501.

It is not an unprimeable number, because it can be changed into a prime (55040527) 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, 948946 + ... + 949003.

It is an arithmetic number, because the mean of its divisors is an integer number (14234625).

Almost surely, 2^55040521 is an apocalyptic number.

It is an amenable number.

55040521 is a deficient number, since it is larger than the sum of its proper divisors (1897979).

55040521 is a wasteful number, since it uses less digits than its factorization.

55040521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1897978.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 55040521 is about 7418.9299093602. The cubic root of 55040521 is about 380.3886167477.

Adding to 55040521 its reverse (12504055), we get a palindrome (67544576).

The spelling of 55040521 in words is "fifty-five million, forty thousand, five hundred twenty-one".