550523521 has 4 divisors (see below), whose sum is σ = 550577412. Its totient is φ = 550469632.

The previous prime is 550523509. The next prime is 550523527. The reversal of 550523521 is 125325055.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 125325055 = 5 ⋅25065011.

It can be written as a sum of positive squares in 2 ways, for example, as 55950400 + 494573121 = 7480^2 + 22239^2 .

It is a cyclic number.

It is not a de Polignac number, because 550523521 - 2⁵ = 550523489 is a prime.

It is a super-2 number, since 2×550523521² = 606152294348474882, which contains 22 as substring.

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 550523521.

It is not an unprimeable number, because it can be changed into a prime (550523527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6400 + ... + 33793.

It is an arithmetic number, because the mean of its divisors is an integer number (137644353).

Almost surely, 2^550523521 is an apocalyptic number.

It is an amenable number.

550523521 is a deficient number, since it is larger than the sum of its proper divisors (53891).

550523521 is a wasteful number, since it uses less digits than its factorization.

550523521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53890.

The product of its (nonzero) digits is 7500, while the sum is 28.

The square root of 550523521 is about 23463.2376495658. The cubic root of 550523521 is about 819.5811468849.

Adding to 550523521 its reverse (125325055), we get a palindrome (675848576).

The spelling of 550523521 in words is "five hundred fifty million, five hundred twenty-three thousand, five hundred twenty-one".