647736641 has 2 divisors, whose sum is σ = 647736642. Its totient is φ = 647736640.

The previous prime is 647736623. The next prime is 647736653. The reversal of 647736641 is 146637746.

647736641 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., 446096641 + 201640000 = 21121^2 + 14200^2 .

It is a cyclic number.

It is not a de Polignac number, because 647736641 - 2¹⁴ = 647720257 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 647736592 and 647736601.

It is not a weakly prime, because it can be changed into another prime (647736611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323868320 + 323868321.

It is an arithmetic number, because the mean of its divisors is an integer number (323868321).

Almost surely, 2^647736641 is an apocalyptic number.

It is an amenable number.

647736641 is a deficient number, since it is larger than the sum of its proper divisors (1).

647736641 is an equidigital number, since it uses as much as digits as its factorization.

647736641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 44.

The square root of 647736641 is about 25450.6707377232. The cubic root of 647736641 is about 865.2324950015.

The spelling of 647736641 in words is "six hundred forty-seven million, seven hundred thirty-six thousand, six hundred forty-one".