671251271 has 2 divisors, whose sum is σ = 671251272. Its totient is φ = 671251270.

The previous prime is 671251223. The next prime is 671251291. The reversal of 671251271 is 172152176.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671251271 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671251291) 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, 335625635 + 335625636.

It is an arithmetic number, because the mean of its divisors is an integer number (335625636).

Almost surely, 2^671251271 is an apocalyptic number.

671251271 is a deficient number, since it is larger than the sum of its proper divisors (1).

671251271 is an equidigital number, since it uses as much as digits as its factorization.

671251271 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5880, while the sum is 32.

The square root of 671251271 is about 25908.5173446880. The cubic root of 671251271 is about 875.5784022269.

The spelling of 671251271 in words is "six hundred seventy-one million, two hundred fifty-one thousand, two hundred seventy-one".