550813 has 2 divisors, whose sum is σ = 550814. Its totient is φ = 550812.

The previous prime is 550811. The next prime is 550831. The reversal of 550813 is 318055.

Together with next prime (550831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 293764 + 257049 = 542^2 + 507^2 .

It is a cyclic number.

It is not a de Polignac number, because 550813 - 2¹ = 550811 is a prime.

Together with 550811, it forms a pair of twin primes.

550813 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (550811) 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, 275406 + 275407.

It is an arithmetic number, because the mean of its divisors is an integer number (275407).

2⁵⁵⁰⁸¹³ is an apocalyptic number.

It is an amenable number.

550813 is a deficient number, since it is larger than the sum of its proper divisors (1).

550813 is an equidigital number, since it uses as much as digits as its factorization.

550813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 550813 is about 742.1677707904. The cubic root of 550813 is about 81.9724773784.

Adding to 550813 its reverse (318055), we get a palindrome (868868).

The spelling of 550813 in words is "five hundred fifty thousand, eight hundred thirteen".