6520239497 has 2 divisors, whose sum is σ = 6520239498. Its totient is φ = 6520239496.

The previous prime is 6520239491. The next prime is 6520239521. The reversal of 6520239497 is 7949320256.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5233654336 + 1286585161 = 72344^2 + 35869^2 .

It is a cyclic number.

It is not a de Polignac number, because 6520239497 - 2⁸ = 6520239241 is a prime.

It is not a weakly prime, because it can be changed into another prime (6520239491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3260119748 + 3260119749.

It is an arithmetic number, because the mean of its divisors is an integer number (3260119749).

Almost surely, 2^6520239497 is an apocalyptic number.

It is an amenable number.

6520239497 is a deficient number, since it is larger than the sum of its proper divisors (1).

6520239497 is an equidigital number, since it uses as much as digits as its factorization.

6520239497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 816480, while the sum is 47.

The square root of 6520239497 is about 80747.9999566553. Note that the first 4 decimals coincide. The cubic root of 6520239497 is about 1868.1906008372.

The spelling of 6520239497 in words is "six billion, five hundred twenty million, two hundred thirty-nine thousand, four hundred ninety-seven".