55050209 has 2 divisors, whose sum is σ = 55050210. Its totient is φ = 55050208.

The previous prime is 55050143. The next prime is 55050217. The reversal of 55050209 is 90205055.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41152225 + 13897984 = 6415^2 + 3728^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55050209 is a prime.

It is not a weakly prime, because it can be changed into another prime (55050269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27525104 + 27525105.

It is an arithmetic number, because the mean of its divisors is an integer number (27525105).

Almost surely, 2^55050209 is an apocalyptic number.

It is an amenable number.

55050209 is a deficient number, since it is larger than the sum of its proper divisors (1).

55050209 is an equidigital number, since it uses as much as digits as its factorization.

55050209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2250, while the sum is 26.

The square root of 55050209 is about 7419.5828049830. The cubic root of 55050209 is about 380.4109335709.

The spelling of 55050209 in words is "fifty-five million, fifty thousand, two hundred nine".