551819209 has 2 divisors, whose sum is σ = 551819210. Its totient is φ = 551819208.

The previous prime is 551819207. The next prime is 551819249. The reversal of 551819209 is 902918155.

It is an a-pointer prime, because the next prime (551819249) can be obtained adding 551819209 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 377447184 + 174372025 = 19428^2 + 13205^2 .

It is a cyclic number.

It is not a de Polignac number, because 551819209 - 2¹ = 551819207 is a prime.

Together with 551819207, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (551819207) 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, 275909604 + 275909605.

It is an arithmetic number, because the mean of its divisors is an integer number (275909605).

Almost surely, 2^551819209 is an apocalyptic number.

It is an amenable number.

551819209 is a deficient number, since it is larger than the sum of its proper divisors (1).

551819209 is an equidigital number, since it uses as much as digits as its factorization.

551819209 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 40.

The square root of 551819209 is about 23490.8324458713. The cubic root of 551819209 is about 820.2236198565.

The spelling of 551819209 in words is "five hundred fifty-one million, eight hundred nineteen thousand, two hundred nine".