647146439 has 2 divisors, whose sum is σ = 647146440. Its totient is φ = 647146438.

The previous prime is 647146411. The next prime is 647146453. The reversal of 647146439 is 934641746.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 647146439 - 2⁸ = 647146183 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 647146439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647146459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323573219 + 323573220.

It is an arithmetic number, because the mean of its divisors is an integer number (323573220).

Almost surely, 2^647146439 is an apocalyptic number.

647146439 is a deficient number, since it is larger than the sum of its proper divisors (1).

647146439 is an equidigital number, since it uses as much as digits as its factorization.

647146439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 44.

The square root of 647146439 is about 25439.0730766669. The cubic root of 647146439 is about 864.9696221526.

The spelling of 647146439 in words is "six hundred forty-seven million, one hundred forty-six thousand, four hundred thirty-nine".