6539790989 has 2 divisors, whose sum is σ = 6539790990. Its totient is φ = 6539790988.

The previous prime is 6539790949. The next prime is 6539791001. The reversal of 6539790989 is 9890979356.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3800106025 + 2739684964 = 61645^2 + 52342^2 .

It is a cyclic number.

It is not a de Polignac number, because 6539790989 - 2¹⁶ = 6539725453 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6539790919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3269895494 + 3269895495.

It is an arithmetic number, because the mean of its divisors is an integer number (3269895495).

Almost surely, 2^6539790989 is an apocalyptic number.

It is an amenable number.

6539790989 is a deficient number, since it is larger than the sum of its proper divisors (1).

6539790989 is an equidigital number, since it uses as much as digits as its factorization.

6539790989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33067440, while the sum is 65.

The square root of 6539790989 is about 80868.9742051919. The cubic root of 6539790989 is about 1870.0560469156.

The spelling of 6539790989 in words is "six billion, five hundred thirty-nine million, seven hundred ninety thousand, nine hundred eighty-nine".