671684971 has 2 divisors, whose sum is σ = 671684972. Its totient is φ = 671684970.

The previous prime is 671684957. The next prime is 671684999. The reversal of 671684971 is 179486176.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 671684971 - 2⁹ = 671684459 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (671684911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335842485 + 335842486.

It is an arithmetic number, because the mean of its divisors is an integer number (335842486).

Almost surely, 2^671684971 is an apocalyptic number.

671684971 is a deficient number, since it is larger than the sum of its proper divisors (1).

671684971 is an equidigital number, since it uses as much as digits as its factorization.

671684971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 49.

The square root of 671684971 is about 25916.8858275835. The cubic root of 671684971 is about 875.7669340108.

The spelling of 671684971 in words is "six hundred seventy-one million, six hundred eighty-four thousand, nine hundred seventy-one".