671019647 has 2 divisors, whose sum is σ = 671019648. Its totient is φ = 671019646.

The previous prime is 671019623. The next prime is 671019709. The reversal of 671019647 is 746910176.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671019647 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671019617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335509823 + 335509824.

It is an arithmetic number, because the mean of its divisors is an integer number (335509824).

Almost surely, 2^671019647 is an apocalyptic number.

671019647 is a deficient number, since it is larger than the sum of its proper divisors (1).

671019647 is an equidigital number, since it uses as much as digits as its factorization.

671019647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 671019647 is about 25904.0469232126. The cubic root of 671019647 is about 875.4776807277.

The spelling of 671019647 in words is "six hundred seventy-one million, nineteen thousand, six hundred forty-seven".