6539309897 has 2 divisors, whose sum is σ = 6539309898. Its totient is φ = 6539309896.

The previous prime is 6539309873. The next prime is 6539309927. The reversal of 6539309897 is 7989039356.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3778437961 + 2760871936 = 61469^2 + 52544^2 .

It is a cyclic number.

It is not a de Polignac number, because 6539309897 - 2¹⁰ = 6539308873 is a prime.

It is not a weakly prime, because it can be changed into another prime (6539309807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3269654948 + 3269654949.

It is an arithmetic number, because the mean of its divisors is an integer number (3269654949).

Almost surely, 2^6539309897 is an apocalyptic number.

It is an amenable number.

6539309897 is a deficient number, since it is larger than the sum of its proper divisors (1).

6539309897 is an equidigital number, since it uses as much as digits as its factorization.

6539309897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11022480, while the sum is 59.

The square root of 6539309897 is about 80865.9996351990. Note that the first 3 decimals coincide. The cubic root of 6539309897 is about 1870.0101896363.

Adding to 6539309897 its sum of digits (59), we get a square (6539309956 = 80866²).

The spelling of 6539309897 in words is "six billion, five hundred thirty-nine million, three hundred nine thousand, eight hundred ninety-seven".