550025621 has 2 divisors, whose sum is σ = 550025622. Its totient is φ = 550025620.

The previous prime is 550025561. The next prime is 550025627. The reversal of 550025621 is 126520055.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 415140625 + 134884996 = 20375^2 + 11614^2 .

It is a cyclic number.

It is not a de Polignac number, because 550025621 - 2¹⁴ = 550009237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (550025627) 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, 275012810 + 275012811.

It is an arithmetic number, because the mean of its divisors is an integer number (275012811).

Almost surely, 2^550025621 is an apocalyptic number.

It is an amenable number.

550025621 is a deficient number, since it is larger than the sum of its proper divisors (1).

550025621 is an equidigital number, since it uses as much as digits as its factorization.

550025621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 550025621 is about 23452.6250343112. The cubic root of 550025621 is about 819.3339927245. Note that the first 3 decimals are identical.

Adding to 550025621 its reverse (126520055), we get a palindrome (676545676).

The spelling of 550025621 in words is "five hundred fifty million, twenty-five thousand, six hundred twenty-one".