646385941 has 2 divisors, whose sum is σ = 646385942. Its totient is φ = 646385940.

The previous prime is 646385921. The next prime is 646385983. The reversal of 646385941 is 149583646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 355171716 + 291214225 = 18846^2 + 17065^2 .

It is a cyclic number.

It is not a de Polignac number, because 646385941 - 2¹¹ = 646383893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 646385891 and 646385900.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646385921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323192970 + 323192971.

It is an arithmetic number, because the mean of its divisors is an integer number (323192971).

Almost surely, 2^646385941 is an apocalyptic number.

It is an amenable number.

646385941 is a deficient number, since it is larger than the sum of its proper divisors (1).

646385941 is an equidigital number, since it uses as much as digits as its factorization.

646385941 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 46.

The square root of 646385941 is about 25424.1212434176. The cubic root of 646385941 is about 864.6306646040.

The spelling of 646385941 in words is "six hundred forty-six million, three hundred eighty-five thousand, nine hundred forty-one".