545221111 has 4 divisors (see below), whose sum is σ = 554159224. Its totient is φ = 536283000.

The previous prime is 545221109. The next prime is 545221133. The reversal of 545221111 is 111122545.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 545221111 - 2¹ = 545221109 is a prime.

It is a super-4 number, since 4×545221111⁴ (a number of 36 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545231111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4468965 + ... + 4469086.

It is an arithmetic number, because the mean of its divisors is an integer number (138539806).

Almost surely, 2^545221111 is an apocalyptic number.

545221111 is a deficient number, since it is larger than the sum of its proper divisors (8938113).

545221111 is an equidigital number, since it uses as much as digits as its factorization.

545221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8938112.

The product of its digits is 400, while the sum is 22.

The square root of 545221111 is about 23349.9702569404. The cubic root of 545221111 is about 816.9413671107.

Adding to 545221111 its reverse (111122545), we get a palindrome (656343656).

The spelling of 545221111 in words is "five hundred forty-five million, two hundred twenty-one thousand, one hundred eleven".