646347907 has 2 divisors, whose sum is σ = 646347908. Its totient is φ = 646347906.

The previous prime is 646347893. The next prime is 646347917. The reversal of 646347907 is 709743646.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646347907 is a prime.

It is not a weakly prime, because it can be changed into another prime (646347917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323173953 + 323173954.

It is an arithmetic number, because the mean of its divisors is an integer number (323173954).

Almost surely, 2^646347907 is an apocalyptic number.

646347907 is a deficient number, since it is larger than the sum of its proper divisors (1).

646347907 is an equidigital number, since it uses as much as digits as its factorization.

646347907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 762048, while the sum is 46.

The square root of 646347907 is about 25423.3732419598. The cubic root of 646347907 is about 864.6137056916.

The spelling of 646347907 in words is "six hundred forty-six million, three hundred forty-seven thousand, nine hundred seven".