647312329 has 2 divisors, whose sum is σ = 647312330. Its totient is φ = 647312328.

The previous prime is 647312321. The next prime is 647312359. The reversal of 647312329 is 923213746.

647312329 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 can be written as a sum of positive squares in only one way, i.e., 543822400 + 103489929 = 23320^2 + 10173^2 .

It is a cyclic number.

It is not a de Polignac number, because 647312329 - 2³ = 647312321 is a prime.

It is not a weakly prime, because it can be changed into another prime (647312321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323656164 + 323656165.

It is an arithmetic number, because the mean of its divisors is an integer number (323656165).

Almost surely, 2^647312329 is an apocalyptic number.

It is an amenable number.

647312329 is a deficient number, since it is larger than the sum of its proper divisors (1).

647312329 is an equidigital number, since it uses as much as digits as its factorization.

647312329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 37.

The square root of 647312329 is about 25442.3334032081. Note that the first 3 decimals coincide. The cubic root of 647312329 is about 865.0435248238.

The spelling of 647312329 in words is "six hundred forty-seven million, three hundred twelve thousand, three hundred twenty-nine".