545145221 has 2 divisors, whose sum is σ = 545145222. Its totient is φ = 545145220.

The previous prime is 545145193. The next prime is 545145311. The reversal of 545145221 is 122541545.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 395572321 + 149572900 = 19889^2 + 12230^2 .

It is a cyclic number.

It is not a de Polignac number, because 545145221 - 2⁶ = 545145157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (545145421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272572610 + 272572611.

It is an arithmetic number, because the mean of its divisors is an integer number (272572611).

Almost surely, 2^545145221 is an apocalyptic number.

It is an amenable number.

545145221 is a deficient number, since it is larger than the sum of its proper divisors (1).

545145221 is an equidigital number, since it uses as much as digits as its factorization.

545145221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8000, while the sum is 29.

The square root of 545145221 is about 23348.3451447849. The cubic root of 545145221 is about 816.9034616593.

Adding to 545145221 its reverse (122541545), we get a palindrome (667686766).

The spelling of 545145221 in words is "five hundred forty-five million, one hundred forty-five thousand, two hundred twenty-one".