6409819397 has 2 divisors, whose sum is σ = 6409819398. Its totient is φ = 6409819396.

The previous prime is 6409819369. The next prime is 6409819421. The reversal of 6409819397 is 7939189046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3519574276 + 2890245121 = 59326^2 + 53761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6409819397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6409819597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3204909698 + 3204909699.

It is an arithmetic number, because the mean of its divisors is an integer number (3204909699).

Almost surely, 2^6409819397 is an apocalyptic number.

It is an amenable number.

6409819397 is a deficient number, since it is larger than the sum of its proper divisors (1).

6409819397 is an equidigital number, since it uses as much as digits as its factorization.

6409819397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2939328, while the sum is 56.

The square root of 6409819397 is about 80061.3477091162. The cubic root of 6409819397 is about 1857.5845816472.

The spelling of 6409819397 in words is "six billion, four hundred nine million, eight hundred nineteen thousand, three hundred ninety-seven".