550656021 has 4 divisors (see below), whose sum is σ = 734208032. Its totient is φ = 367104012.

The previous prime is 550656013. The next prime is 550656037. The reversal of 550656021 is 120656055.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 550656021 - 2³ = 550656013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 550656021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (550651021) 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 in 3 ways as a sum of consecutive naturals, for example, 91776001 + ... + 91776006.

It is an arithmetic number, because the mean of its divisors is an integer number (183552008).

Almost surely, 2^550656021 is an apocalyptic number.

It is an amenable number.

550656021 is a deficient number, since it is larger than the sum of its proper divisors (183552011).

550656021 is a wasteful number, since it uses less digits than its factorization.

550656021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183552010.

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 550656021 is about 23466.0610456889. The cubic root of 550656021 is about 819.6468938735.

The spelling of 550656021 in words is "five hundred fifty million, six hundred fifty-six thousand, twenty-one".