647741071309 has 2 divisors, whose sum is σ = 647741071310. Its totient is φ = 647741071308.

The previous prime is 647741071231. The next prime is 647741071321. The reversal of 647741071309 is 903170147746.

647741071309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 644953548100 + 2787523209 = 803090^2 + 52797^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-647741071309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647741071399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323870535654 + 323870535655.

It is an arithmetic number, because the mean of its divisors is an integer number (323870535655).

Almost surely, 2^647741071309 is an apocalyptic number.

It is an amenable number.

647741071309 is a deficient number, since it is larger than the sum of its proper divisors (1).

647741071309 is an equidigital number, since it uses as much as digits as its factorization.

647741071309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 889056, while the sum is 49.

The spelling of 647741071309 in words is "six hundred forty-seven billion, seven hundred forty-one million, seventy-one thousand, three hundred nine".