6390545509 has 2 divisors, whose sum is σ = 6390545510. Its totient is φ = 6390545508.

The previous prime is 6390545507. The next prime is 6390545527. The reversal of 6390545509 is 9055450936.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5891023009 + 499522500 = 76753^2 + 22350^2 .

It is a cyclic number.

It is not a de Polignac number, because 6390545509 - 2¹ = 6390545507 is a prime.

Together with 6390545507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6390545507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3195272754 + 3195272755.

It is an arithmetic number, because the mean of its divisors is an integer number (3195272755).

Almost surely, 2^6390545509 is an apocalyptic number.

It is an amenable number.

6390545509 is a deficient number, since it is larger than the sum of its proper divisors (1).

6390545509 is an equidigital number, since it uses as much as digits as its factorization.

6390545509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 729000, while the sum is 46.

The square root of 6390545509 is about 79940.8875920201. The cubic root of 6390545509 is about 1855.7208358002.

The spelling of 6390545509 in words is "six billion, three hundred ninety million, five hundred forty-five thousand, five hundred nine".