671671 has 24 divisors (see below), whose sum is σ = 923552. Its totient is φ = 475200.

The previous prime is 671651. The next prime is 671681. The reversal of 671671 is 176176.

671671 is nontrivially palindromic in base 9.

It is not a de Polignac number, because 671671 - 2⁹ = 671159 is a prime.

It is a super-2 number, since 2×671671² = 902283864482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10981 + ... + 11041.

2⁶⁷¹⁶⁷¹ is an apocalyptic number.

671671 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

671671 is a deficient number, since it is larger than the sum of its proper divisors (251881).

671671 is a wasteful number, since it uses less digits than its factorization.

671671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103 (or 92 counting only the distinct ones).

The product of its digits is 1764, while the sum is 28.

The square root of 671671 is about 819.5553672571. Note that the first 3 decimals coincide. The cubic root of 671671 is about 87.5760862005.

The spelling of 671671 in words is "six hundred seventy-one thousand, six hundred seventy-one".