647682197 has 2 divisors, whose sum is σ = 647682198. Its totient is φ = 647682196.

The previous prime is 647682193. The next prime is 647682221. The reversal of 647682197 is 791286746.

647682197 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 459416356 + 188265841 = 21434^2 + 13721^2 .

It is a cyclic number.

It is not a de Polignac number, because 647682197 - 2² = 647682193 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647682193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323841098 + 323841099.

It is an arithmetic number, because the mean of its divisors is an integer number (323841099).

Almost surely, 2^647682197 is an apocalyptic number.

It is an amenable number.

647682197 is a deficient number, since it is larger than the sum of its proper divisors (1).

647682197 is an equidigital number, since it uses as much as digits as its factorization.

647682197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 50.

The square root of 647682197 is about 25449.6011167169. The cubic root of 647682197 is about 865.2082526192.

The spelling of 647682197 in words is "six hundred forty-seven million, six hundred eighty-two thousand, one hundred ninety-seven".