671911 has 2 divisors, whose sum is σ = 671912. Its totient is φ = 671910.

The previous prime is 671903. The next prime is 671917. The reversal of 671911 is 119176.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 671911 - 2³ = 671903 is a prime.

671911 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 671911.

It is not a weakly prime, because it can be changed into another prime (671917) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335955 + 335956.

It is an arithmetic number, because the mean of its divisors is an integer number (335956).

2⁶⁷¹⁹¹¹ is an apocalyptic number.

671911 is a deficient number, since it is larger than the sum of its proper divisors (1).

671911 is an equidigital number, since it uses as much as digits as its factorization.

671911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 378, while the sum is 25.

The square root of 671911 is about 819.7017750377. The cubic root of 671911 is about 87.5865157897.

It can be divided in two parts, 6 and 71911, that added together give a palindrome (71917).

The spelling of 671911 in words is "six hundred seventy-one thousand, nine hundred eleven".