550421 has 4 divisors (see below), whose sum is σ = 553644. Its totient is φ = 547200.

The previous prime is 550379. The next prime is 550427. The reversal of 550421 is 124055.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 264196 + 286225 = 514^2 + 535^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-550421 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 550421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (550427) 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, 1340 + ... + 1701.

It is an arithmetic number, because the mean of its divisors is an integer number (138411).

2⁵⁵⁰⁴²¹ is an apocalyptic number.

It is an amenable number.

550421 is a deficient number, since it is larger than the sum of its proper divisors (3223).

550421 is a wasteful number, since it uses less digits than its factorization.

550421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3222.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 550421 is about 741.9036325561. The cubic root of 550421 is about 81.9530268347.

Adding to 550421 its reverse (124055), we get a palindrome (674476).

The spelling of 550421 in words is "five hundred fifty thousand, four hundred twenty-one".