647266847 has 2 divisors, whose sum is σ = 647266848. Its totient is φ = 647266846.

The previous prime is 647266843. The next prime is 647266889. The reversal of 647266847 is 748662746.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 647266847 - 2² = 647266843 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 647266795 and 647266804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647266843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323633423 + 323633424.

It is an arithmetic number, because the mean of its divisors is an integer number (323633424).

Almost surely, 2^647266847 is an apocalyptic number.

647266847 is a deficient number, since it is larger than the sum of its proper divisors (1).

647266847 is an equidigital number, since it uses as much as digits as its factorization.

647266847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2709504, while the sum is 50.

The square root of 647266847 is about 25441.4395622575. The cubic root of 647266847 is about 865.0232642122.

The spelling of 647266847 in words is "six hundred forty-seven million, two hundred sixty-six thousand, eight hundred forty-seven".