671811 has 8 divisors (see below), whose sum is σ = 1023744. Its totient is φ = 383880.

The previous prime is 671791. The next prime is 671831. The reversal of 671811 is 118176.

It is an interprime number because it is at equal distance from previous prime (671791) and next prime (671831).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 671811 - 2⁵ = 671779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (671831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15975 + ... + 16016.

It is an arithmetic number, because the mean of its divisors is an integer number (127968).

2⁶⁷¹⁸¹¹ is an apocalyptic number.

671811 is a deficient number, since it is larger than the sum of its proper divisors (351933).

671811 is a wasteful number, since it uses less digits than its factorization.

671811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32001.

The product of its digits is 336, while the sum is 24.

The square root of 671811 is about 819.6407749740. The cubic root of 671811 is about 87.5821704294.

Adding to 671811 its reverse (118176), we get a palindrome (789987).

It can be divided in two parts, 6 and 71811, that added together give a palindrome (71817).

The spelling of 671811 in words is "six hundred seventy-one thousand, eight hundred eleven".