539509 has 2 divisors, whose sum is σ = 539510. Its totient is φ = 539508.

The previous prime is 539507. The next prime is 539533. The reversal of 539509 is 905935.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 521284 + 18225 = 722^2 + 135^2 .

It is a cyclic number.

It is not a de Polignac number, because 539509 - 2¹ = 539507 is a prime.

It is a super-2 number, since 2×539509² = 582139922162, which contains 22 as substring.

Together with 539507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (539501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269754 + 269755.

It is an arithmetic number, because the mean of its divisors is an integer number (269755).

2⁵³⁹⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

539509 is a deficient number, since it is larger than the sum of its proper divisors (1).

539509 is an equidigital number, since it uses as much as digits as its factorization.

539509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6075, while the sum is 31.

The square root of 539509 is about 734.5127636740. The cubic root of 539509 is about 81.4078399200.

The spelling of 539509 in words is "five hundred thirty-nine thousand, five hundred nine".