543508909 has 4 divisors (see below), whose sum is σ = 543875904. Its totient is φ = 543141916.

The previous prime is 543508897. The next prime is 543508943. The reversal of 543508909 is 909805345.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 909805345 = 5 ⋅181961069.

It is a cyclic number.

It is not a de Polignac number, because 543508909 - 2⁵ = 543508877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (543502909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181267 + ... + 184240.

It is an arithmetic number, because the mean of its divisors is an integer number (135968976).

Almost surely, 2^543508909 is an apocalyptic number.

It is an amenable number.

543508909 is a deficient number, since it is larger than the sum of its proper divisors (366995).

543508909 is a wasteful number, since it uses less digits than its factorization.

543508909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366994.

The product of its (nonzero) digits is 194400, while the sum is 43.

The square root of 543508909 is about 23313.2775259078. The cubic root of 543508909 is about 816.0853013199.

The spelling of 543508909 in words is "five hundred forty-three million, five hundred eight thousand, nine hundred nine".