550028909 has 2 divisors, whose sum is σ = 550028910. Its totient is φ = 550028908.

The previous prime is 550028903. The next prime is 550028911. The reversal of 550028909 is 909820055.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 350513284 + 199515625 = 18722^2 + 14125^2 .

It is a cyclic number.

It is not a de Polignac number, because 550028909 - 2⁴ = 550028893 is a prime.

Together with 550028911, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (550028903) 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 as a sum of consecutive naturals, namely, 275014454 + 275014455.

It is an arithmetic number, because the mean of its divisors is an integer number (275014455).

Almost surely, 2^550028909 is an apocalyptic number.

It is an amenable number.

550028909 is a deficient number, since it is larger than the sum of its proper divisors (1).

550028909 is an equidigital number, since it uses as much as digits as its factorization.

550028909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 38.

The square root of 550028909 is about 23452.6951329693. The cubic root of 550028909 is about 819.3356253544.

The spelling of 550028909 in words is "five hundred fifty million, twenty-eight thousand, nine hundred nine".