319681321 has 8 divisors (see below), whose sum is σ = 328565120. Its totient is φ = 310918608.

The previous prime is 319681283. The next prime is 319681363. The reversal of 319681321 is 123186913.

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

It is a cyclic number.

It is not a de Polignac number, because 319681321 - 2¹¹ = 319679273 is a prime.

It is a super-2 number, since 2×319681321² = 204392293992610082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (319681391) 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, 24906 + ... + 35491.

It is an arithmetic number, because the mean of its divisors is an integer number (41070640).

Almost surely, 2^319681321 is an apocalyptic number.

It is an amenable number.

319681321 is a deficient number, since it is larger than the sum of its proper divisors (8883799).

319681321 is an equidigital number, since it uses as much as digits as its factorization.

319681321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60543.

The product of its digits is 7776, while the sum is 34.

The square root of 319681321 is about 17879.6342524113. The cubic root of 319681321 is about 683.7632476626.

The spelling of 319681321 in words is "three hundred nineteen million, six hundred eighty-one thousand, three hundred twenty-one".