646274339 has 2 divisors, whose sum is σ = 646274340. Its totient is φ = 646274338.

The previous prime is 646274323. The next prime is 646274381. The reversal of 646274339 is 933472646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 646274339 - 2⁴ = 646274323 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 646274339.

It is not a weakly prime, because it can be changed into another prime (640274339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323137169 + 323137170.

It is an arithmetic number, because the mean of its divisors is an integer number (323137170).

Almost surely, 2^646274339 is an apocalyptic number.

646274339 is a deficient number, since it is larger than the sum of its proper divisors (1).

646274339 is an equidigital number, since it uses as much as digits as its factorization.

646274339 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 44.

The square root of 646274339 is about 25421.9263432180. The cubic root of 646274339 is about 864.5809006991.

The spelling of 646274339 in words is "six hundred forty-six million, two hundred seventy-four thousand, three hundred thirty-nine".