8539820689 has 2 divisors, whose sum is σ = 8539820690. Its totient is φ = 8539820688.

The previous prime is 8539820687. The next prime is 8539820699. The reversal of 8539820689 is 9860289358.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7725003664 + 814817025 = 87892^2 + 28545^2 .

It is a cyclic number.

It is not a de Polignac number, because 8539820689 - 2¹ = 8539820687 is a prime.

Together with 8539820687, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (8539820687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4269910344 + 4269910345.

It is an arithmetic number, because the mean of its divisors is an integer number (4269910345).

Almost surely, 2^8539820689 is an apocalyptic number.

It is an amenable number.

8539820689 is a deficient number, since it is larger than the sum of its proper divisors (1).

8539820689 is an equidigital number, since it uses as much as digits as its factorization.

8539820689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7464960, while the sum is 58.

The square root of 8539820689 is about 92411.1502417322. The cubic root of 8539820689 is about 2044.0095345678.

The spelling of 8539820689 in words is "eight billion, five hundred thirty-nine million, eight hundred twenty thousand, six hundred eighty-nine".