647798443 has 2 divisors, whose sum is σ = 647798444. Its totient is φ = 647798442.

The previous prime is 647798441. The next prime is 647798453. The reversal of 647798443 is 344897746.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 647798443 - 2¹ = 647798441 is a prime.

Together with 647798441, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (647798441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323899221 + 323899222.

It is an arithmetic number, because the mean of its divisors is an integer number (323899222).

Almost surely, 2^647798443 is an apocalyptic number.

647798443 is a deficient number, since it is larger than the sum of its proper divisors (1).

647798443 is an equidigital number, since it uses as much as digits as its factorization.

647798443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4064256, while the sum is 52.

The square root of 647798443 is about 25451.8848614400. The cubic root of 647798443 is about 865.2600120481.

The spelling of 647798443 in words is "six hundred forty-seven million, seven hundred ninety-eight thousand, four hundred forty-three".