550555021 has 2 divisors, whose sum is σ = 550555022. Its totient is φ = 550555020.

The previous prime is 550555007. The next prime is 550555051. The reversal of 550555021 is 120555055.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 548964900 + 1590121 = 23430^2 + 1261^2 .

It is a cyclic number.

It is not a de Polignac number, because 550555021 - 2⁵ = 550554989 is a prime.

It is a super-2 number, since 2×550555021² = 606221662296620882, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (550555051) 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, 275277510 + 275277511.

It is an arithmetic number, because the mean of its divisors is an integer number (275277511).

Almost surely, 2^550555021 is an apocalyptic number.

It is an amenable number.

550555021 is a deficient number, since it is larger than the sum of its proper divisors (1).

550555021 is an equidigital number, since it uses as much as digits as its factorization.

550555021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6250, while the sum is 28.

The square root of 550555021 is about 23463.9089028235. The cubic root of 550555021 is about 819.5967782568.

The spelling of 550555021 in words is "five hundred fifty million, five hundred fifty-five thousand, twenty-one".