671941 has 2 divisors, whose sum is σ = 671942. Its totient is φ = 671940.

The previous prime is 671939. The next prime is 671947. The reversal of 671941 is 149176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 519841 + 152100 = 721^2 + 390^2 .

It is a cyclic number.

It is not a de Polignac number, because 671941 - 2¹ = 671939 is a prime.

Together with 671939, it forms a pair of twin primes.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335970 + 335971.

It is an arithmetic number, because the mean of its divisors is an integer number (335971).

2⁶⁷¹⁹⁴¹ is an apocalyptic number.

It is an amenable number.

671941 is a deficient number, since it is larger than the sum of its proper divisors (1).

671941 is an equidigital number, since it uses as much as digits as its factorization.

671941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 28.

The square root of 671941 is about 819.7200741717. The cubic root of 671941 is about 87.5878193137.

The spelling of 671941 in words is "six hundred seventy-one thousand, nine hundred forty-one".