545736321 has 27 divisors (see below), whose sum is σ = 855014979. Its totient is φ = 335277072.

The previous prime is 545736287. The next prime is 545736337. The reversal of 545736321 is 123637545.

The square root of 545736321 is 23361.

It is a perfect power (a square), and thus also a powerful number.

545736321 is a `hidden beast` number, since 5 + 4 + 573 + 63 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 80730225 + 465006096 = 8985^2 + 21564^2 .

It is a de Polignac number, because none of the positive numbers 2^k-545736321 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (545736361) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 910780 + ... + 911378.

Almost surely, 2^545736321 is an apocalyptic number.

545736321 is the 23361-st square number.

545736321 is the 11681-st centered octagonal number.

It is an amenable number.

545736321 is a deficient number, since it is larger than the sum of its proper divisors (309278658).

545736321 is an equidigital number, since it uses as much as digits as its factorization.

545736321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1230 (or 615 counting only the distinct ones).

The product of its digits is 75600, while the sum is 36.

The cubic root of 545736321 is about 817.1986106685.

Multiplying 545736321 by its sum of digits (36), we get a square (19646507556 = 140166²).

It can be divided in two parts, 54 and 5736321, that added together give a palindrome (5736375).

The spelling of 545736321 in words is "five hundred forty-five million, seven hundred thirty-six thousand, three hundred twenty-one".