55500217 has 2 divisors, whose sum is σ = 55500218. Its totient is φ = 55500216.

The previous prime is 55500209. The next prime is 55500227. The reversal of 55500217 is 71200555.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35331136 + 20169081 = 5944^2 + 4491^2 .

It is a cyclic number.

It is not a de Polignac number, because 55500217 - 2³ = 55500209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 55500191 and 55500200.

It is not a weakly prime, because it can be changed into another prime (55500227) 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 as a sum of consecutive naturals, namely, 27750108 + 27750109.

It is an arithmetic number, because the mean of its divisors is an integer number (27750109).

Almost surely, 2^55500217 is an apocalyptic number.

It is an amenable number.

55500217 is a deficient number, since it is larger than the sum of its proper divisors (1).

55500217 is an equidigital number, since it uses as much as digits as its factorization.

55500217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1750, while the sum is 25.

The square root of 55500217 is about 7449.8467769478. The cubic root of 55500217 is about 381.4446784295. Note that the first 3 decimals are identical.

The spelling of 55500217 in words is "fifty-five million, five hundred thousand, two hundred seventeen".