55015521 has 32 divisors (see below), whose sum is σ = 82944000. Its totient is φ = 32148480.

The previous prime is 55015487. The next prime is 55015529. The reversal of 55015521 is 12551055.

55015521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55015521 - 2¹⁴ = 54999137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 55015491 and 55015500.

It is not an unprimeable number, because it can be changed into a prime (55015529) 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 31 ways as a sum of consecutive naturals, for example, 122305 + ... + 122753.

It is an arithmetic number, because the mean of its divisors is an integer number (2592000).

Almost surely, 2^55015521 is an apocalyptic number.

It is an amenable number.

55015521 is a deficient number, since it is larger than the sum of its proper divisors (27928479).

55015521 is a wasteful number, since it uses less digits than its factorization.

55015521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589.

The product of its (nonzero) digits is 1250, while the sum is 24.

The square root of 55015521 is about 7417.2448388873. The cubic root of 55015521 is about 380.3310158178.

Adding to 55015521 its reverse (12551055), we get a palindrome (67566576).

The spelling of 55015521 in words is "fifty-five million, fifteen thousand, five hundred twenty-one".