6397030721 has 2 divisors, whose sum is σ = 6397030722. Its totient is φ = 6397030720.

The previous prime is 6397030667. The next prime is 6397030747. The reversal of 6397030721 is 1270307936.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5873536321 + 523494400 = 76639^2 + 22880^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6397030721 is a prime.

It is not a weakly prime, because it can be changed into another prime (6397030921) 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, 3198515360 + 3198515361.

It is an arithmetic number, because the mean of its divisors is an integer number (3198515361).

Almost surely, 2^6397030721 is an apocalyptic number.

It is an amenable number.

6397030721 is a deficient number, since it is larger than the sum of its proper divisors (1).

6397030721 is an equidigital number, since it uses as much as digits as its factorization.

6397030721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47628, while the sum is 38.

The square root of 6397030721 is about 79981.4398532560. The cubic root of 6397030721 is about 1856.3483604407.

The spelling of 6397030721 in words is "six billion, three hundred ninety-seven million, thirty thousand, seven hundred twenty-one".