671487917 has 2 divisors, whose sum is σ = 671487918. Its totient is φ = 671487916.

The previous prime is 671487853. The next prime is 671487941. The reversal of 671487917 is 719784176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 646227241 + 25260676 = 25421^2 + 5026^2 .

It is a cyclic number.

It is not a de Polignac number, because 671487917 - 2⁶ = 671487853 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 (671487617) 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, 335743958 + 335743959.

It is an arithmetic number, because the mean of its divisors is an integer number (335743959).

Almost surely, 2^671487917 is an apocalyptic number.

It is an amenable number.

671487917 is a deficient number, since it is larger than the sum of its proper divisors (1).

671487917 is an equidigital number, since it uses as much as digits as its factorization.

671487917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 592704, while the sum is 50.

The square root of 671487917 is about 25913.0838959781. The cubic root of 671487917 is about 875.6812836123.

The spelling of 671487917 in words is "six hundred seventy-one million, four hundred eighty-seven thousand, nine hundred seventeen".