671946997 has 2 divisors, whose sum is σ = 671946998. Its totient is φ = 671946996.

The previous prime is 671946983. The next prime is 671947037. The reversal of 671946997 is 799649176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 483736036 + 188210961 = 21994^2 + 13719^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671946997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671946697) 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, 335973498 + 335973499.

It is an arithmetic number, because the mean of its divisors is an integer number (335973499).

Almost surely, 2^671946997 is an apocalyptic number.

It is an amenable number.

671946997 is a deficient number, since it is larger than the sum of its proper divisors (1).

671946997 is an equidigital number, since it uses as much as digits as its factorization.

671946997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5143824, while the sum is 58.

The square root of 671946997 is about 25921.9404559149. The cubic root of 671946997 is about 875.8807988351.

The spelling of 671946997 in words is "six hundred seventy-one million, nine hundred forty-six thousand, nine hundred ninety-seven".