4545223121 has 4 divisors (see below), whose sum is σ = 4556558244. Its totient is φ = 4533888000.

The previous prime is 4545223093. The next prime is 4545223159. The reversal of 4545223121 is 1213225454.

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 4508451025 + 36772096 = 67145^2 + 6064^2 .

It is a cyclic number.

It is not a de Polignac number, because 4545223121 - 2⁶ = 4545223057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4545223171) 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 in 3 ways as a sum of consecutive naturals, for example, 5666960 + ... + 5667761.

It is an arithmetic number, because the mean of its divisors is an integer number (1139139561).

Almost surely, 2^4545223121 is an apocalyptic number.

It is an amenable number.

4545223121 is a deficient number, since it is larger than the sum of its proper divisors (11335123).

4545223121 is a wasteful number, since it uses less digits than its factorization.

4545223121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11335122.

The product of its digits is 9600, while the sum is 29.

The square root of 4545223121 is about 67418.2699347884. The cubic root of 4545223121 is about 1656.4756991467.

Adding to 4545223121 its reverse (1213225454), we get a palindrome (5758448575).

The spelling of 4545223121 in words is "four billion, five hundred forty-five million, two hundred twenty-three thousand, one hundred twenty-one".