550581121 has 2 divisors, whose sum is σ = 550581122. Its totient is φ = 550581120.

The previous prime is 550581103. The next prime is 550581137. The reversal of 550581121 is 121185055.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 382593600 + 167987521 = 19560^2 + 12961^2 .

It is a cyclic number.

It is not a de Polignac number, because 550581121 - 2⁵ = 550581089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 550581121.

It is not a weakly prime, because it can be changed into another prime (550581191) 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, 275290560 + 275290561.

It is an arithmetic number, because the mean of its divisors is an integer number (275290561).

Almost surely, 2^550581121 is an apocalyptic number.

It is an amenable number.

550581121 is a deficient number, since it is larger than the sum of its proper divisors (1).

550581121 is an equidigital number, since it uses as much as digits as its factorization.

550581121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2000, while the sum is 28.

The square root of 550581121 is about 23464.4650695472. The cubic root of 550581121 is about 819.6097295133.

The spelling of 550581121 in words is "five hundred fifty million, five hundred eighty-one thousand, one hundred twenty-one".