6439347197 has 2 divisors, whose sum is σ = 6439347198. Its totient is φ = 6439347196.

The previous prime is 6439347169. The next prime is 6439347319. The reversal of 6439347197 is 7917439346.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5533276996 + 906070201 = 74386^2 + 30101^2 .

It is a cyclic number.

It is not a de Polignac number, because 6439347197 - 2⁸ = 6439346941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6439347157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3219673598 + 3219673599.

It is an arithmetic number, because the mean of its divisors is an integer number (3219673599).

Almost surely, 2^6439347197 is an apocalyptic number.

It is an amenable number.

6439347197 is a deficient number, since it is larger than the sum of its proper divisors (1).

6439347197 is an equidigital number, since it uses as much as digits as its factorization.

6439347197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3429216, while the sum is 53.

The square root of 6439347197 is about 80245.5431597294. The cubic root of 6439347197 is about 1860.4326273298.

The spelling of 6439347197 in words is "six billion, four hundred thirty-nine million, three hundred forty-seven thousand, one hundred ninety-seven".