545221213 has 2 divisors, whose sum is σ = 545221214. Its totient is φ = 545221212.

The previous prime is 545221163. The next prime is 545221217. The reversal of 545221213 is 312122545.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 543962329 + 1258884 = 23323^2 + 1122^2 .

It is a cyclic number.

It is not a de Polignac number, because 545221213 - 2¹⁷ = 545090141 is a prime.

It is a super-2 number, since 2×545221213² = 594532342210382738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (545221217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272610606 + 272610607.

It is an arithmetic number, because the mean of its divisors is an integer number (272610607).

Almost surely, 2^545221213 is an apocalyptic number.

It is an amenable number.

545221213 is a deficient number, since it is larger than the sum of its proper divisors (1).

545221213 is an equidigital number, since it uses as much as digits as its factorization.

545221213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2400, while the sum is 25.

The square root of 545221213 is about 23349.9724410972. The cubic root of 545221213 is about 816.9414180552.

Adding to 545221213 its reverse (312122545), we get a palindrome (857343758).

It can be divided in two parts, 5452212 and 13, that added together give a square (5452225 = 2335²).

The spelling of 545221213 in words is "five hundred forty-five million, two hundred twenty-one thousand, two hundred thirteen".