646602109 has 2 divisors, whose sum is σ = 646602110. Its totient is φ = 646602108.

The previous prime is 646602049. The next prime is 646602127. The reversal of 646602109 is 901206646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 361836484 + 284765625 = 19022^2 + 16875^2 .

It is a cyclic number.

It is not a de Polignac number, because 646602109 - 2⁷ = 646601981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646602139) 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, 323301054 + 323301055.

It is an arithmetic number, because the mean of its divisors is an integer number (323301055).

Almost surely, 2^646602109 is an apocalyptic number.

It is an amenable number.

646602109 is a deficient number, since it is larger than the sum of its proper divisors (1).

646602109 is an equidigital number, since it uses as much as digits as its factorization.

646602109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 646602109 is about 25428.3721264260. The cubic root of 646602109 is about 864.7270387350.

The spelling of 646602109 in words is "six hundred forty-six million, six hundred two thousand, one hundred nine".