646346489 has 2 divisors, whose sum is σ = 646346490. Its totient is φ = 646346488.

The previous prime is 646346419. The next prime is 646346507. The reversal of 646346489 is 984643646.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 553802089 + 92544400 = 23533^2 + 9620^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646346489 is a prime.

It is not a weakly prime, because it can be changed into another prime (646346419) 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, 323173244 + 323173245.

It is an arithmetic number, because the mean of its divisors is an integer number (323173245).

Almost surely, 2^646346489 is an apocalyptic number.

It is an amenable number.

646346489 is a deficient number, since it is larger than the sum of its proper divisors (1).

646346489 is an equidigital number, since it uses as much as digits as its factorization.

646346489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2985984, while the sum is 50.

The square root of 646346489 is about 25423.3453542212. The cubic root of 646346489 is about 864.6130734092.

The spelling of 646346489 in words is "six hundred forty-six million, three hundred forty-six thousand, four hundred eighty-nine".