547730921 has 4 divisors (see below), whose sum is σ = 547876932. Its totient is φ = 547584912.

The previous prime is 547730881. The next prime is 547730923. The reversal of 547730921 is 129037745.

547730921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 262796521 + 284934400 = 16211^2 + 16880^2 .

It is a cyclic number.

It is not a de Polignac number, because 547730921 - 2²⁶ = 480622057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (547730923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67226 + ... + 74931.

It is an arithmetic number, because the mean of its divisors is an integer number (136969233).

Almost surely, 2^547730921 is an apocalyptic number.

It is an amenable number.

547730921 is a deficient number, since it is larger than the sum of its proper divisors (146011).

547730921 is a wasteful number, since it uses less digits than its factorization.

547730921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146010.

The product of its (nonzero) digits is 52920, while the sum is 38.

The square root of 547730921 is about 23403.6518731586. The cubic root of 547730921 is about 818.1929874461.

The spelling of 547730921 in words is "five hundred forty-seven million, seven hundred thirty thousand, nine hundred twenty-one".