539664409 has 2 divisors, whose sum is σ = 539664410. Its totient is φ = 539664408.

The previous prime is 539664407. The next prime is 539664413. The reversal of 539664409 is 904466935.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 421398784 + 118265625 = 20528^2 + 10875^2 .

It is a cyclic number.

It is not a de Polignac number, because 539664409 - 2¹ = 539664407 is a prime.

Together with 539664407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (539664407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269832204 + 269832205.

It is an arithmetic number, because the mean of its divisors is an integer number (269832205).

Almost surely, 2^539664409 is an apocalyptic number.

It is an amenable number.

539664409 is a deficient number, since it is larger than the sum of its proper divisors (1).

539664409 is an equidigital number, since it uses as much as digits as its factorization.

539664409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 699840, while the sum is 46.

The square root of 539664409 is about 23230.6781863983. The cubic root of 539664409 is about 814.1565585170.

The spelling of 539664409 in words is "five hundred thirty-nine million, six hundred sixty-four thousand, four hundred nine".