671791 has 2 divisors, whose sum is σ = 671792. Its totient is φ = 671790.

The previous prime is 671779. The next prime is 671831. The reversal of 671791 is 197176.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 671791 - 2¹³ = 663599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335895 + 335896.

It is an arithmetic number, because the mean of its divisors is an integer number (335896).

2⁶⁷¹⁷⁹¹ is an apocalyptic number.

671791 is a deficient number, since it is larger than the sum of its proper divisors (1).

671791 is an equidigital number, since it uses as much as digits as its factorization.

671791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2646, while the sum is 31.

The square root of 671791 is about 819.6285744165. The cubic root of 671791 is about 87.5813013056.

The spelling of 671791 in words is "six hundred seventy-one thousand, seven hundred ninety-one".