545116321 has 4 divisors (see below), whose sum is σ = 545875200. Its totient is φ = 544357444.

The previous prime is 545116309. The next prime is 545116349. The reversal of 545116321 is 123611545.

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.

It is a cyclic number.

It is not a de Polignac number, because 545116321 - 2¹⁷ = 544985249 is a prime.

It is a super-4 number, since 4×545116321⁴ (a number of 36 digits) contains 4444 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 545116321.

It is not an unprimeable number, because it can be changed into a prime (545116381) 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, 378361 + ... + 379798.

It is an arithmetic number, because the mean of its divisors is an integer number (136468800).

Almost surely, 2^545116321 is an apocalyptic number.

It is an amenable number.

545116321 is a deficient number, since it is larger than the sum of its proper divisors (758879).

545116321 is an equidigital number, since it uses as much as digits as its factorization.

545116321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758878.

The product of its digits is 3600, while the sum is 28.

The square root of 545116321 is about 23347.7262490376. The cubic root of 545116321 is about 816.8890257950.

Adding to 545116321 its reverse (123611545), we get a palindrome (668727866).

The spelling of 545116321 in words is "five hundred forty-five million, one hundred sixteen thousand, three hundred twenty-one".