545408321 has 2 divisors, whose sum is σ = 545408322. Its totient is φ = 545408320.

The previous prime is 545408267. The next prime is 545408323. The reversal of 545408321 is 123804545.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 470412721 + 74995600 = 21689^2 + 8660^2 .

It is a cyclic number.

It is not a de Polignac number, because 545408321 - 2¹⁸ = 545146177 is a prime.

Together with 545408323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (545408323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272704160 + 272704161.

It is an arithmetic number, because the mean of its divisors is an integer number (272704161).

Almost surely, 2^545408321 is an apocalyptic number.

It is an amenable number.

545408321 is a deficient number, since it is larger than the sum of its proper divisors (1).

545408321 is an equidigital number, since it uses as much as digits as its factorization.

545408321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19200, while the sum is 32.

The square root of 545408321 is about 23353.9786974297. The cubic root of 545408321 is about 817.0348595116.

The spelling of 545408321 in words is "five hundred forty-five million, four hundred eight thousand, three hundred twenty-one".