647342329 has 2 divisors, whose sum is σ = 647342330. Its totient is φ = 647342328.

The previous prime is 647342323. The next prime is 647342347. The reversal of 647342329 is 923243746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 646532329 + 810000 = 25427^2 + 900^2 .

It is a cyclic number.

It is not a de Polignac number, because 647342329 - 2²⁵ = 613787897 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 647342291 and 647342300.

It is not a weakly prime, because it can be changed into another prime (647342323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323671164 + 323671165.

It is an arithmetic number, because the mean of its divisors is an integer number (323671165).

Almost surely, 2^647342329 is an apocalyptic number.

It is an amenable number.

647342329 is a deficient number, since it is larger than the sum of its proper divisors (1).

647342329 is an equidigital number, since it uses as much as digits as its factorization.

647342329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 40.

The square root of 647342329 is about 25442.9229649425. The cubic root of 647342329 is about 865.0568882362.

The spelling of 647342329 in words is "six hundred forty-seven million, three hundred forty-two thousand, three hundred twenty-nine".