816671 has 4 divisors (see below), whose sum is σ = 818712. Its totient is φ = 814632.

The previous prime is 816667. The next prime is 816689. The reversal of 816671 is 176618.

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 816671 - 2² = 816667 is a prime.

It is a Duffinian 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 816671.

It is not an unprimeable number, because it can be changed into a prime (816691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200 + ... + 1293.

It is an arithmetic number, because the mean of its divisors is an integer number (204678).

2⁸¹⁶⁶⁷¹ is an apocalyptic number.

816671 is a deficient number, since it is larger than the sum of its proper divisors (2041).

816671 is a wasteful number, since it uses less digits than its factorization.

816671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2040.

The product of its digits is 2016, while the sum is 29.

The square root of 816671 is about 903.6985116730. The cubic root of 816671 is about 93.4721813778.

The spelling of 816671 in words is "eight hundred sixteen thousand, six hundred seventy-one".