545097221 has 2 divisors, whose sum is σ = 545097222. Its totient is φ = 545097220.

The previous prime is 545097199. The next prime is 545097229. The reversal of 545097221 is 122790545.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 353966596 + 191130625 = 18814^2 + 13825^2 .

It is a cyclic number.

It is not a de Polignac number, because 545097221 - 2¹⁸ = 544835077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (545097229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272548610 + 272548611.

It is an arithmetic number, because the mean of its divisors is an integer number (272548611).

Almost surely, 2^545097221 is an apocalyptic number.

It is an amenable number.

545097221 is a deficient number, since it is larger than the sum of its proper divisors (1).

545097221 is an equidigital number, since it uses as much as digits as its factorization.

545097221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 545097221 is about 23347.3172120482. The cubic root of 545097221 is about 816.8794848573.

The spelling of 545097221 in words is "five hundred forty-five million, ninety-seven thousand, two hundred twenty-one".