646006903 has 2 divisors, whose sum is σ = 646006904. Its totient is φ = 646006902.

The previous prime is 646006891. The next prime is 646006943. The reversal of 646006903 is 309600646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 646006903 - 2⁹ = 646006391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646006943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323003451 + 323003452.

It is an arithmetic number, because the mean of its divisors is an integer number (323003452).

Almost surely, 2^646006903 is an apocalyptic number.

646006903 is a deficient number, since it is larger than the sum of its proper divisors (1).

646006903 is an equidigital number, since it uses as much as digits as its factorization.

646006903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 646006903 is about 25416.6658513661. The cubic root of 646006903 is about 864.4616262956.

The spelling of 646006903 in words is "six hundred forty-six million, six thousand, nine hundred three".