550811 has 2 divisors, whose sum is σ = 550812. Its totient is φ = 550810.

The previous prime is 550801. The next prime is 550813. The reversal of 550811 is 118055.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-550811 is a prime.

Together with 550813, 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 (550813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275405 + 275406.

It is an arithmetic number, because the mean of its divisors is an integer number (275406).

2⁵⁵⁰⁸¹¹ is an apocalyptic number.

550811 is a deficient number, since it is larger than the sum of its proper divisors (1).

550811 is an equidigital number, since it uses as much as digits as its factorization.

550811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 550811 is about 742.1664233849. The cubic root of 550811 is about 81.9723781644.

Adding to 550811 its reverse (118055), we get a palindrome (668866).

The spelling of 550811 in words is "five hundred fifty thousand, eight hundred eleven".