671915771 has 2 divisors, whose sum is σ = 671915772. Its totient is φ = 671915770.

The previous prime is 671915743. The next prime is 671915773. The reversal of 671915771 is 177519176.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 671915771 - 2⁶ = 671915707 is a prime.

It is a Sophie Germain prime.

Together with 671915773, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (671915773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335957885 + 335957886.

It is an arithmetic number, because the mean of its divisors is an integer number (335957886).

Almost surely, 2^671915771 is an apocalyptic number.

671915771 is a deficient number, since it is larger than the sum of its proper divisors (1).

671915771 is an equidigital number, since it uses as much as digits as its factorization.

671915771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92610, while the sum is 44.

The square root of 671915771 is about 25921.3381406130. The cubic root of 671915771 is about 875.8672309606.

The spelling of 671915771 in words is "six hundred seventy-one million, nine hundred fifteen thousand, seven hundred seventy-one".