55505217 has 32 divisors (see below), whose sum is σ = 80657280. Its totient is φ = 33868800.

The previous prime is 55505207. The next prime is 55505227. The reversal of 55505217 is 71250555.

55505217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (55505207) and next prime (55505227).

It is not a de Polignac number, because 55505217 - 2⁸ = 55504961 is a prime.

It is a super-2 number, since 2×55505217² = 6161658228434178, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55505207) 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, 138217 + ... + 138617.

It is an arithmetic number, because the mean of its divisors is an integer number (2520540).

Almost surely, 2^55505217 is an apocalyptic number.

It is an amenable number.

55505217 is a deficient number, since it is larger than the sum of its proper divisors (25152063).

55505217 is a wasteful number, since it uses less digits than its factorization.

55505217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513.

The product of its (nonzero) digits is 8750, while the sum is 30.

The square root of 55505217 is about 7450.1823467617. The cubic root of 55505217 is about 381.4561328359.

The spelling of 55505217 in words is "fifty-five million, five hundred five thousand, two hundred seventeen".