671685321 has 8 divisors (see below), whose sum is σ = 942716320. Its totient is φ = 424222272.

The previous prime is 671685293. The next prime is 671685349. The reversal of 671685321 is 123586176.

It is an interprime number because it is at equal distance from previous prime (671685293) and next prime (671685349).

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

It is not a de Polignac number, because 671685321 - 2⁶ = 671685257 is a prime.

It is a super-2 number, since 2×671685321² = 902322340893746082, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 671685321.

It is not an unprimeable number, because it can be changed into a prime (671685121) 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, 5891920 + ... + 5892033.

It is an arithmetic number, because the mean of its divisors is an integer number (117839540).

Almost surely, 2^671685321 is an apocalyptic number.

It is an amenable number.

671685321 is a deficient number, since it is larger than the sum of its proper divisors (271030999).

671685321 is a wasteful number, since it uses less digits than its factorization.

671685321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11783975.

The product of its digits is 60480, while the sum is 39.

The square root of 671685321 is about 25916.8925799371. The cubic root of 671685321 is about 875.7670861249.

The spelling of 671685321 in words is "six hundred seventy-one million, six hundred eighty-five thousand, three hundred twenty-one".