8539820651 has 2 divisors, whose sum is σ = 8539820652. Its totient is φ = 8539820650.

The previous prime is 8539820591. The next prime is 8539820687. The reversal of 8539820651 is 1560289358.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8539820651 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 8539820596 and 8539820605.

It is not a weakly prime, because it can be changed into another prime (8539820951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4269910325 + 4269910326.

It is an arithmetic number, because the mean of its divisors is an integer number (4269910326).

Almost surely, 2^8539820651 is an apocalyptic number.

8539820651 is a deficient number, since it is larger than the sum of its proper divisors (1).

8539820651 is an equidigital number, since it uses as much as digits as its factorization.

8539820651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 518400, while the sum is 47.

The square root of 8539820651 is about 92411.1500361293. The cubic root of 8539820651 is about 2044.0095315361.

The spelling of 8539820651 in words is "eight billion, five hundred thirty-nine million, eight hundred twenty thousand, six hundred fifty-one".