548397509 has 16 divisors (see below), whose sum is σ = 648902016. Its totient is φ = 457766400.

The previous prime is 548397491. The next prime is 548397523. The reversal of 548397509 is 905793845.

548397509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 548397509 - 2⁸ = 548397253 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (548397529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28097 + ... + 43430.

It is an arithmetic number, because the mean of its divisors is an integer number (40556376).

Almost surely, 2^548397509 is an apocalyptic number.

It is an amenable number.

548397509 is a deficient number, since it is larger than the sum of its proper divisors (100504507).

548397509 is a wasteful number, since it uses less digits than its factorization.

548397509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71596.

The product of its (nonzero) digits is 1360800, while the sum is 50.

The square root of 548397509 is about 23417.8886537621. Note that the first 3 decimals coincide. The cubic root of 548397509 is about 818.5247662486.

The spelling of 548397509 in words is "five hundred forty-eight million, three hundred ninety-seven thousand, five hundred nine".