545243221 has 8 divisors (see below), whose sum is σ = 587303424. Its totient is φ = 504712560.

The previous prime is 545243219. The next prime is 545243263. The reversal of 545243221 is 122342545.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 545243221 - 2¹ = 545243219 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 545243221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545243291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 381646 + ... + 383071.

It is an arithmetic number, because the mean of its divisors is an integer number (73412928).

Almost surely, 2^545243221 is an apocalyptic number.

It is an amenable number.

545243221 is a deficient number, since it is larger than the sum of its proper divisors (42060203).

545243221 is a wasteful number, since it uses less digits than its factorization.

545243221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764771.

The product of its digits is 9600, while the sum is 28.

The square root of 545243221 is about 23350.4437002812. The cubic root of 545243221 is about 816.9524099269.

Adding to 545243221 its reverse (122342545), we get a palindrome (667585766).

The spelling of 545243221 in words is "five hundred forty-five million, two hundred forty-three thousand, two hundred twenty-one".