550861 has 2 divisors, whose sum is σ = 550862. Its totient is φ = 550860.

The previous prime is 550859. The next prime is 550903. The reversal of 550861 is 168055.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 352836 + 198025 = 594^2 + 445^2 .

It is a cyclic number.

It is not a de Polignac number, because 550861 - 2¹ = 550859 is a prime.

Together with 550859, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (550801) 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, 275430 + 275431.

It is an arithmetic number, because the mean of its divisors is an integer number (275431).

2⁵⁵⁰⁸⁶¹ is an apocalyptic number.

It is an amenable number.

550861 is a deficient number, since it is larger than the sum of its proper divisors (1).

550861 is an equidigital number, since it uses as much as digits as its factorization.

550861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 550861 is about 742.2001077877. The cubic root of 550861 is about 81.9748584434.

The spelling of 550861 in words is "five hundred fifty thousand, eight hundred sixty-one".