671771 has 4 divisors (see below), whose sum is σ = 686112. Its totient is φ = 657432.

The previous prime is 671753. The next prime is 671777. The reversal of 671771 is 177176.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 671771 - 2¹⁴ = 655387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671777) 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 in 3 ways as a sum of consecutive naturals, for example, 7100 + ... + 7193.

It is an arithmetic number, because the mean of its divisors is an integer number (171528).

2⁶⁷¹⁷⁷¹ is an apocalyptic number.

671771 is a deficient number, since it is larger than the sum of its proper divisors (14341).

671771 is a wasteful number, since it uses less digits than its factorization.

671771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14340.

The product of its digits is 2058, while the sum is 29.

The square root of 671771 is about 819.6163736773. The cubic root of 671771 is about 87.5804321646.

The spelling of 671771 in words is "six hundred seventy-one thousand, seven hundred seventy-one".