543865009321 has 12 divisors (see below), whose sum is σ = 556647169108. Its totient is φ = 531369649152.

The previous prime is 543865009313. The next prime is 543865009349. The reversal of 543865009321 is 123900568345.

It can be written as a sum of positive squares in 2 ways, for example, as 504675264025 + 39189745296 = 710405^2 + 197964^2 .

It is not a de Polignac number, because 543865009321 - 2³ = 543865009313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (543865000321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1061245 + ... + 1487941.

Almost surely, 2^543865009321 is an apocalyptic number.

It is an amenable number.

543865009321 is a deficient number, since it is larger than the sum of its proper divisors (12782159787).

543865009321 is an equidigital number, since it uses as much as digits as its factorization.

543865009321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427368 (or 427321 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 46.

The spelling of 543865009321 in words is "five hundred forty-three billion, eight hundred sixty-five million, nine thousand, three hundred twenty-one".