647696843 has 2 divisors, whose sum is σ = 647696844. Its totient is φ = 647696842.

The previous prime is 647696837. The next prime is 647696869. The reversal of 647696843 is 348696746.

647696843 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 is a cyclic number.

It is not a de Polignac number, because 647696843 - 2¹⁸ = 647434699 is a prime.

It is a super-2 number, since 2×647696843² = 839022400864333298, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (647696873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323848421 + 323848422.

It is an arithmetic number, because the mean of its divisors is an integer number (323848422).

Almost surely, 2^647696843 is an apocalyptic number.

647696843 is a deficient number, since it is larger than the sum of its proper divisors (1).

647696843 is an equidigital number, since it uses as much as digits as its factorization.

647696843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5225472, while the sum is 53.

The square root of 647696843 is about 25449.8888602681. Note that the first 4 decimals coincide. The cubic root of 647696843 is about 865.2147742047.

The spelling of 647696843 in words is "six hundred forty-seven million, six hundred ninety-six thousand, eight hundred forty-three".