545420221 has 2 divisors, whose sum is σ = 545420222. Its totient is φ = 545420220.

The previous prime is 545420189. The next prime is 545420263. The reversal of 545420221 is 122024545.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 301716900 + 243703321 = 17370^2 + 15611^2 .

It is a cyclic number.

It is not a de Polignac number, because 545420221 - 2⁵ = 545420189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (545420021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272710110 + 272710111.

It is an arithmetic number, because the mean of its divisors is an integer number (272710111).

Almost surely, 2^545420221 is an apocalyptic number.

It is an amenable number.

545420221 is a deficient number, since it is larger than the sum of its proper divisors (1).

545420221 is an equidigital number, since it uses as much as digits as its factorization.

545420221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 545420221 is about 23354.2334706151. The cubic root of 545420221 is about 817.0408016310.

Adding to 545420221 its reverse (122024545), we get a palindrome (667444766).

The spelling of 545420221 in words is "five hundred forty-five million, four hundred twenty thousand, two hundred twenty-one".