545756221 has 4 divisors (see below), whose sum is σ = 545957500. Its totient is φ = 545554944.

The previous prime is 545756177. The next prime is 545756243. The reversal of 545756221 is 122657545.

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

It can be written as a sum of positive squares in 2 ways, for example, as 195692121 + 350064100 = 13989^2 + 18710^2 .

It is a cyclic number.

It is not a de Polignac number, because 545756221 - 2²¹ = 543659069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545756251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96516 + ... + 102013.

It is an arithmetic number, because the mean of its divisors is an integer number (136489375).

Almost surely, 2^545756221 is an apocalyptic number.

It is an amenable number.

545756221 is a deficient number, since it is larger than the sum of its proper divisors (201279).

545756221 is a wasteful number, since it uses less digits than its factorization.

545756221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201278.

The product of its digits is 84000, while the sum is 37.

The square root of 545756221 is about 23361.4259196651. The cubic root of 545756221 is about 817.2085434597.

The spelling of 545756221 in words is "five hundred forty-five million, seven hundred fifty-six thousand, two hundred twenty-one".