646436347 has 2 divisors, whose sum is σ = 646436348. Its totient is φ = 646436346.

The previous prime is 646436341. The next prime is 646436359. The reversal of 646436347 is 743634646.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646436347 is a prime.

It is not a weakly prime, because it can be changed into another prime (646436341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323218173 + 323218174.

It is an arithmetic number, because the mean of its divisors is an integer number (323218174).

Almost surely, 2^646436347 is an apocalyptic number.

646436347 is a deficient number, since it is larger than the sum of its proper divisors (1).

646436347 is an equidigital number, since it uses as much as digits as its factorization.

646436347 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 43.

The square root of 646436347 is about 25425.1125267913. The cubic root of 646436347 is about 864.6531390204.

The spelling of 646436347 in words is "six hundred forty-six million, four hundred thirty-six thousand, three hundred forty-seven".