4540815221 has 4 divisors (see below), whose sum is σ = 4541090700. Its totient is φ = 4540539744.

The previous prime is 4540815217. The next prime is 4540815229. The reversal of 4540815221 is 1225180454.

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 2163180100 + 2377635121 = 46510^2 + 48761^2 .

It is a cyclic number.

It is not a de Polignac number, because 4540815221 - 2² = 4540815217 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 (4540815229) 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, 111326 + ... + 146543.

It is an arithmetic number, because the mean of its divisors is an integer number (1135272675).

Almost surely, 2^4540815221 is an apocalyptic number.

It is an amenable number.

4540815221 is a deficient number, since it is larger than the sum of its proper divisors (275479).

4540815221 is a wasteful number, since it uses less digits than its factorization.

4540815221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275478.

The product of its (nonzero) digits is 12800, while the sum is 32.

The square root of 4540815221 is about 67385.5713116688. The cubic root of 4540815221 is about 1655.9400495472.

Adding to 4540815221 its reverse (1225180454), we get a palindrome (5765995675).

The spelling of 4540815221 in words is "four billion, five hundred forty million, eight hundred fifteen thousand, two hundred twenty-one".