6390244009 has 2 divisors, whose sum is σ = 6390244010. Its totient is φ = 6390244008.

The previous prime is 6390243991. The next prime is 6390244057. The reversal of 6390244009 is 9004420936.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4671312409 + 1718931600 = 68347^2 + 41460^2 .

It is a cyclic number.

It is not a de Polignac number, because 6390244009 - 2¹⁵ = 6390211241 is a prime.

It is not a weakly prime, because it can be changed into another prime (6390248009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3195122004 + 3195122005.

It is an arithmetic number, because the mean of its divisors is an integer number (3195122005).

Almost surely, 2^6390244009 is an apocalyptic number.

It is an amenable number.

6390244009 is a deficient number, since it is larger than the sum of its proper divisors (1).

6390244009 is an equidigital number, since it uses as much as digits as its factorization.

6390244009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 6390244009 is about 79939.0018013735. The cubic root of 6390244009 is about 1855.6916516129.

The spelling of 6390244009 in words is "six billion, three hundred ninety million, two hundred forty-four thousand, nine".