550500921 has 24 divisors (see below), whose sum is σ = 835040160. Its totient is φ = 358433208.

The previous prime is 550500917. The next prime is 550500941. The reversal of 550500921 is 129005055.

It is not a de Polignac number, because 550500921 - 2² = 550500917 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (550500941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44410 + ... + 55436.

It is an arithmetic number, because the mean of its divisors is an integer number (34793340).

Almost surely, 2^550500921 is an apocalyptic number.

It is an amenable number.

550500921 is a deficient number, since it is larger than the sum of its proper divisors (284539239).

550500921 is a wasteful number, since it uses less digits than its factorization.

550500921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11122 (or 11073 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 27.

The square root of 550500921 is about 23462.7560401586. The cubic root of 550500921 is about 819.5699316284.

Adding to 550500921 its reverse (129005055), we get a palindrome (679505976).

The spelling of 550500921 in words is "five hundred fifty million, five hundred thousand, nine hundred twenty-one".