545340221 has 8 divisors (see below), whose sum is σ = 561543864. Its totient is φ = 529274880.

The previous prime is 545340217. The next prime is 545340253. The reversal of 545340221 is 122043545.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5707321 + 539632900 = 2389^2 + 23230^2 .

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 545340221 - 2² = 545340217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545340121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26546 + ... + 42371.

It is an arithmetic number, because the mean of its divisors is an integer number (70192983).

Almost surely, 2^545340221 is an apocalyptic number.

It is an amenable number.

545340221 is a deficient number, since it is larger than the sum of its proper divisors (16203643).

545340221 is a wasteful number, since it uses less digits than its factorization.

545340221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69151.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 545340221 is about 23352.5206562375. The cubic root of 545340221 is about 817.0008529470. Note that the first 3 decimals are identical.

Adding to 545340221 its reverse (122043545), we get a palindrome (667383766).

The spelling of 545340221 in words is "five hundred forty-five million, three hundred forty thousand, two hundred twenty-one".