543423509 has 2 divisors, whose sum is σ = 543423510. Its totient is φ = 543423508.

The previous prime is 543423497. The next prime is 543423557. The reversal of 543423509 is 905324345.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 519384100 + 24039409 = 22790^2 + 4903^2 .

It is a cyclic number.

It is not a de Polignac number, because 543423509 - 2⁸ = 543423253 is a prime.

It is a super-2 number, since 2×543423509² = 590618220267746162, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (543423709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271711754 + 271711755.

It is an arithmetic number, because the mean of its divisors is an integer number (271711755).

Almost surely, 2^543423509 is an apocalyptic number.

It is an amenable number.

543423509 is a deficient number, since it is larger than the sum of its proper divisors (1).

543423509 is an equidigital number, since it uses as much as digits as its factorization.

543423509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 35.

The square root of 543423509 is about 23311.4458796532. The cubic root of 543423509 is about 816.0425560314.

The spelling of 543423509 in words is "five hundred forty-three million, four hundred twenty-three thousand, five hundred nine".