545120321 has 4 divisors (see below), whose sum is σ = 552798144. Its totient is φ = 537442500.

The previous prime is 545120311. The next prime is 545120327. The reversal of 545120321 is 123021545.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 123021545 = 5 ⋅24604309.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-545120321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (545120327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3838805 + ... + 3838946.

It is an arithmetic number, because the mean of its divisors is an integer number (138199536).

Almost surely, 2^545120321 is an apocalyptic number.

It is an amenable number.

545120321 is a deficient number, since it is larger than the sum of its proper divisors (7677823).

545120321 is an equidigital number, since it uses as much as digits as its factorization.

545120321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7677822.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 545120321 is about 23347.8119103268. The cubic root of 545120321 is about 816.8910238689.

Adding to 545120321 its reverse (123021545), we get a palindrome (668141866).

The spelling of 545120321 in words is "five hundred forty-five million, one hundred twenty thousand, three hundred twenty-one".