6539742089 has 2 divisors, whose sum is σ = 6539742090. Its totient is φ = 6539742088.

The previous prime is 6539742061. The next prime is 6539742091. The reversal of 6539742089 is 9802479356.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6539471689 + 270400 = 80867^2 + 520^2 .

It is a cyclic number.

It is not a de Polignac number, because 6539742089 - 2²⁸ = 6271306633 is a prime.

It is a Sophie Germain prime.

Together with 6539742091, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6539742089.

It is not a weakly prime, because it can be changed into another prime (6539742689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3269871044 + 3269871045.

It is an arithmetic number, because the mean of its divisors is an integer number (3269871045).

Almost surely, 2^6539742089 is an apocalyptic number.

It is an amenable number.

6539742089 is a deficient number, since it is larger than the sum of its proper divisors (1).

6539742089 is an equidigital number, since it uses as much as digits as its factorization.

6539742089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3265920, while the sum is 53.

The square root of 6539742089 is about 80868.6718637075. The cubic root of 6539742089 is about 1870.0513859120.

The spelling of 6539742089 in words is "six billion, five hundred thirty-nine million, seven hundred forty-two thousand, eighty-nine".