671817 has 4 divisors (see below), whose sum is σ = 895760. Its totient is φ = 447876.

The previous prime is 671791. The next prime is 671831. The reversal of 671817 is 718176.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 671817 - 2⁶ = 671753 is a prime.

It is a D-number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 671817.

It is not an unprimeable number, because it can be changed into a prime (671837) 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, 111967 + ... + 111972.

It is an arithmetic number, because the mean of its divisors is an integer number (223940).

2⁶⁷¹⁸¹⁷ is an apocalyptic number.

It is an amenable number.

671817 is a deficient number, since it is larger than the sum of its proper divisors (223943).

671817 is a wasteful number, since it uses less digits than its factorization.

671817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223942.

The product of its digits is 2352, while the sum is 30.

The square root of 671817 is about 819.6444351059. The cubic root of 671817 is about 87.5824311632.

The spelling of 671817 in words is "six hundred seventy-one thousand, eight hundred seventeen".