671321 has 8 divisors (see below), whose sum is σ = 793920. Its totient is φ = 555408.

The previous prime is 671303. The next prime is 671323. The reversal of 671321 is 123176.

It is a happy number.

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

It is not a de Polignac number, because 671321 - 2⁶ = 671257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 671293 and 671302.

It is not an unprimeable number, because it can be changed into a prime (671323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1451 + ... + 1856.

It is an arithmetic number, because the mean of its divisors is an integer number (99240).

2⁶⁷¹³²¹ is an apocalyptic number.

It is an amenable number.

671321 is a deficient number, since it is larger than the sum of its proper divisors (122599).

671321 is a wasteful number, since it uses less digits than its factorization.

671321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3343.

The product of its digits is 252, while the sum is 20.

The square root of 671321 is about 819.3418090150. The cubic root of 671321 is about 87.5608719286.

Adding to 671321 its reverse (123176), we get a palindrome (794497).

The spelling of 671321 in words is "six hundred seventy-one thousand, three hundred twenty-one".