547838305921 has 3 divisors (see below), whose sum is σ = 547839046083. Its totient is φ = 547837565760.

The previous prime is 547838305891. The next prime is 547838305933. The reversal of 547838305921 is 129503838745.

The square root of 547838305921 is 740161.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 129503838745 = 5 ⋅25900767749.

It can be written as a sum of positive squares in only one way, i.e., 385751545921 + 162086760000 = 621089^2 + 402600^2 .

It is not a de Polignac number, because 547838305921 - 2⁹ = 547838305409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (547838305961) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 370081 + ... + 1110241.

It is an arithmetic number, because the mean of its divisors is an integer number (182613015361).

Almost surely, 2^547838305921 is an apocalyptic number.

547838305921 is the 740161-st square number.

547838305921 is the 370081-st centered octagonal number.

It is an amenable number.

547838305921 is a deficient number, since it is larger than the sum of its proper divisors (740162).

547838305921 is an frugal number, since it uses more digits than its factorization.

547838305921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1480322 (or 740161 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 55.

The spelling of 547838305921 in words is "five hundred forty-seven billion, eight hundred thirty-eight million, three hundred five thousand, nine hundred twenty-one".